How to Make Tres Leches (Milky) Bath Bombs with Extra Bubbles


If you’re looking for a way to elevate your bath time, these luxurious oats and milky bath bombs with a pinch of extra bubbles are perfect for creating a spa-like experience at home.

Using organic ingredients like whole milk, goat milk, coconut milk,(tres leches) and a touch of roses for a gentle scent, these bath bombs are designed to soothe, soften, and nourish your skin. Their plain milky color gives them a pure and elegant feel, while the added oats bring calming benefits. The extra bubbles add a playful element, making your bath time even more indulgent.

This article will guide you through the step-by-step process of creating these bath bombs, highlighting the benefits of each ingredient and offering tips to make them just right.

Why “Tres Leches”?

The name “Tres Leches” comes from the rich combination of three nourishing milks in this recipe:

  • Coconut Milk: Known for its hydrating and soothing properties, coconut milk adds a tropical twist to your bath, leaving your skin feeling soft and silky.
  • Whole Milk: High in vitamins and fats, whole milk is a traditional skin-softening ingredient that helps to deeply moisturize your skin.
  • Goat Milk: A natural moisturizer, goat milk is packed with nutrients that help nourish the skin, making it ideal for dry or sensitive skin types.

Additionally, I’ve included powdered oats, which further enhances the soothing properties of these bath bombs. Oats have been used for centuries to calm irritated skin and provide gentle exfoliation, making them the perfect addition to this luxurious recipe


Why Choose Milk in Bath Bombs?

known for their deeply moisturizing and rejuvenating effects on the skin. Famous figures indulged in milk baths to maintain smooth, supple skin. Milk is a natural source of vitamins, minerals, and healthy fats, which help to nourish dry or sensitive skin.

By incorporating milk powder into your bath bombs, you can enjoy these benefits in a convenient and luxurious way without the hassle of preparing a milk bath every time.

How Milk Bath Bombs Are Different from Regular Bath Bombs

Unlike regular bath bombs that focus on fizz and fragrance, milk bath bombs take things a step further by infusing the water with a creamy, luxurious texture that envelops your skin. Here’s why milk bath bombs stand out:

  • Fizzy Fun Meets Nourishing Hydration: While regular bath bombs are great for creating a fun, bubbly bath experience, milk bath bombs provide that same fizz with added moisture and softness. It’s like a mini spa treatment in a single bath bomb.
  • Shelf-Stable Convenience: Using powdered milk in bath bombs ensures they remain shelf-stable, so you can enjoy a milk bath anytime, without worrying about having fresh milk on hand.
  • Customizable Formulations: Whether you opt for goat’s milk, coconut milk, or even oat milk powder, you can tailor your bath bombs to meet specific skin needs. This makes them versatile and adaptable to different preferences.

Benefits of tres leches Bath Bombs

  • Skin Moisturization: Whole milk, coconut milk, and goat milk are packed with fats, vitamins, and proteins that deeply moisturize and soften the skin. These natural ingredients leave your skin feeling smooth and hydrated after the bath.
  • Soothing for Sensitive Skin: Oats are known for their anti-inflammatory properties and are excellent for soothing sensitive or irritated skin. They can help with conditions like eczema and dry patches.
  • Aromatherapy: The light touch of rose petals provides a subtle yet relaxing aroma, offering a calming effect during your bath.
  • Extra Bubbles: Who doesn’t love a little extra foam? The added bubbles create a luxurious texture to your bath, making it even more enjoyable.

Ingredients and Ratios

  • 1 cup Baking Soda (50%)
    Provides fizz and helps soften water.
  • 1/2 cup Citric Acid (25%)
    Essential for the fizzing reaction.
  • 1/2 cup Cornstarch (25%)
    Adds a silky texture to the bathwater.
  • 1/2 cup Organic Whole Milk Powder (25%)
    Adds creaminess and moisture for the skin.
  • 1/4 cup Organic Goat Milk Powder (12.5%)
    Enhances skin hydration and softness.
  • 1/4 cup Ground Oats (12.5%)
    Soothes irritated skin and adds gentle exfoliation.
  • 2 tbsp Epsom Salt (6.25%)
    Relieves muscle tension and promotes relaxation.
  • 2 tbsp SLSA (Sodium Lauryl Sulfoacetate, 6.25%)
    A gentle foaming agent for extra bubbles.
  • 3 tbsp Coconut Oil (9.375%)
    Moisturizes and binds the ingredients.
  • 10-15 drops Rose Essential Oil (for fragrance)
    Adds a light, floral scent.
  • Dried Organic Rose Petals (a pinch for added fragrance and aesthetic)
  • Witch Hazel (in a spray bottle, used to bind the bath bombs)
  • Bath Bomb Molds (preferably round, but any shape will work)

Important Tip: Add Citric Acid Last

When making bath bombs, it’s crucial to add the citric acid at the end of your mixing process. This is because citric acid is what reacts with the baking soda to create the fizz when the bath bomb hits water. If you add the citric acid too early, any moisture in your ingredients could activate the reaction prematurely, causing your bath bombs to lose their fizz. By mixing the dry ingredients first and only adding the citric acid at the very end, you help ensure that your bath bombs will fizz perfectly when dropped into your bath.

Step-by-Step Instructions

Prepare Your Workspace:
Begin by laying out all your ingredients and tools. Make sure your molds are ready and your work area is clean and dry.

Mix Dry Ingredients:

In a large mixing bowl, combine the baking soda, citric acid, cornstarch, whole milk powder, goat milk powder, ground oats, and Epsom salt. Stir well to ensure all ingredients are evenly distributed.

Add SLSA for Bubbles:

Slowly add the SLSA ( Sodium Lauryl Sulfoacetate) to the dry mixture. This will provide the extra bubbles in your bath. Be careful when handling SLSA as it can become airborne; wearing a mask can help prevent irritation.

Incorporate Wet Ingredients:
In a small bowl, melt the coconut oil until it’s liquid. Add the rose essential oil and stir. Gradually pour the oil mixture into the dry ingredients, stirring as you go to ensure everything is combined. The mixture should start to clump together slightly.

Spritz with Witch Hazel or water:
If your mixture feels too dry, lightly spritz it with witch hazel. The goal is to achieve a consistency where the mixture holds together when pressed but is not too wet.

Add Dried Rose Petals:
Sprinkle a few dried rose petals into the bottom of each bath bomb mold for a decorative touch. This adds a subtle elegance and fragrance to your bath bombs.

Pack the Molds and Unmold:

Firmly press the bath bomb mixture into your molds. Be sure to pack it tightly to avoid crumbling when the bombs dry. Press the two halves of the mold together, allowing them to set.

Dry: Let your bath bombs dry for at least 24 hours in a cool, dry place. Once fully hardened, they’re ready to use!

When making these indulgent oats and milky bath bombs, the right mold can make all the difference in achieving that perfect, professional finish. For this project, I’m using a custom mini set of gumball bath bomb molds, which I sourced from this Etsy shop. These molds are specifically designed to create small, perfectly round bath bombs that are not only easy to handle but also look incredibly polished and high-end.

One of the things I love about using this mold is that it allows me to unmold the bath bombs immediately after pressing them, which helps them dry faster and ensures they maintain their shape. The mini size is also perfect for a quick, single-use bath or for gifting as part of a luxurious self-care package.

By using a professional mold, these bath bombs will stand out with their uniform size and smooth finish, giving them that extra touch of luxury that makes them feel special—both as a treat for yourself or as a thoughtful gift.

How to Use

Simply drop one of these milky bath bombs into a warm bath and watch it fizz and dissolve. The bath will turn creamy and soothing, with gentle bubbles rising to the surface. Relax and enjoy the moisturizing and calming effects.

Why Organic Ingredients Matter?

Choosing organic ingredients ensures that your bath bombs are free from harsh chemicals, pesticides, and synthetic additives. Organic coconut milk, whole milk, goat milk, and oats are packed with vitamins and nutrients that retain their potency, giving your skin the purest form of nourishment. When you choose organic, you’re investing in the health and wellness of your skin.

Can you use fresh milk in bath bombs?

It’s recommended to use powdered milk rather than fresh milk for bath bombs. Powdered milk keeps the bath bombs shelf-stable and prevents spoilage. Fresh milk, while moisturizing, would require refrigeration and could spoil quickly.

Are milk bath bombs safe for sensitive skin?

Yes, milk bath bombs are generally safe for sensitive skin, especially when made with gentle ingredients like goat’s milk or oat milk. Always choose high-quality, organic powders and avoid synthetic fragrances or dyes to reduce the risk of irritation.

Do milk bath bombs affect water quality?

Milk bath bombs dissolve completely and do not negatively impact water quality. The powdered milk dissolves smoothly, leaving no residue behind. However, it’s best to avoid adding too much of any bath product to prevent clogging your drain.

How long do milk bath bombs last?

Milk bath bombs typically last 6-12 months when stored in a cool, dry place. As with any bath bomb, it’s best to use them sooner rather than later to enjoy the full potency of the ingredients.

Tips to Elevate Your Bath Bombs

Customize with Essential Oils: While rose oil is perfect for relaxation, you can experiment with other essential oils to create different moods. Try lavender for calming effects, eucalyptus for refreshing vibes, or citrus oils like orange or lemon for an energizing bath.

Make Mini Bath Bombs: Instead of making regular-sized bath bombs, consider making mini versions for quick baths or foot soaks. Mini bath bombs are easier to handle and can be used more frequently.

Common Issues and Solutions

  • Bath Bombs Crumbling?
    If your bath bombs crumble when you remove them from the mold, the mixture might have been too dry. Add a bit more coconut oil or spritz with more witch hazel to achieve the right consistency.
  • Bath Bombs Expanding or Cracking?
    This could be due to too much moisture in the mixture, which can activate the fizzing reaction prematurely. Be sure to add liquids slowly and mix thoroughly to prevent this.
  • No Fizz?
    If your bath bombs aren’t fizzing as expected, it could be that your citric acid has lost its potency. Ensure you’re using fresh ingredients and store them in airtight containers.

How These Bath Bombs Fit into a Self-Care Routine

Incorporating these oats and milky bath bombs into your self-care routine can elevate your relaxation practices. Taking a bath is more than just cleansing the body—it’s a ritual for the mind and soul. Imagine winding down after a long day with a warm, bubbly bath, the scent of roses enveloping you as your skin drinks in the rich nutrients from milk and oats. It’s the perfect way to disconnect from daily stressors and reconnect with yourself.


These tres leches milky bath bombs are not just about relaxation—they’re about nourishing your skin and creating a truly luxurious bath experience. The combination of organic ingredients, extra bubbles, and a pinch of rose petals will make these bath bombs a staple in your self-care routine.

By focusing on high-quality ingredients and thoughtful details, these bath bombs will stand out from the crowd, offering a unique, spa-like experience at home.

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