How to Make Breast Milk Soap: Recipes You Can Try at Home

By Marsha Harrison

how to make breast milk soap

Babies are not the only ones who benefit from breast milk. Recent scientific studies have shown that it can be used topically to treat adults with skin problems, such as dermatitis and eczema.

Consequently, moms are experimenting with all sorts of DIY projects with their extra bags of breast milk before they expire.

In this tutorial on how to make breast milk soap, I’ve compiled two easy recipes you can try at home. Just so you know, these formulas are safe both for kids and adults!

Step-by-Step Guide for Melt and Pour Technique


What to prepare:

For this recipe, you need the following:

  • 450 grams of soap base (makes 5 bars)
  • 1 cup of breast milk for every 450 grams of soap
  • Microwave-safe mixing bowl and spatula
  • Your choice of mold
  • Optional:
  • 1 teaspoon of your preferred essential oils
  • 1 tablespoon of coffee grounds

Step 1: Melt your soap base and let it cool down

Cut your pour into about 1-inch cubes and melt them in a microwave.

Morgan Manages Mommyhood suggests doing it in 30-second intervals. You will have to take out the bowl and gently stir the soap. Then, repeat the process.

Using this technique, you can prevent bubbles from forming when you transfer the milk into the mold.

Lastly, let it cool down.

Step 2: Pour the breast milk and other extras

Now that your soap is in its liquid form, pour the milk into the bowl. With your spatula, stir gently to combine the two ingredients.

Once the mixture has a smooth consistency, you can start adding your essential oils or exfoliant like coffee grounds.

This recipe on Focus on Your Child blog recommends 1 teaspoon of essential oils. I highly recommend lavender and chamomile but feel free to explore other options.

Step 3: Transfer the mixture into your silicone molds and let it set

Pour your mixture into your molds and place them in your fridge. Your soap mixture should harden in a couple of hours.

Although you can start using them, Work and Mother suggest keeping the soap refrigerated overnight.

After that, you can start removing the breast milk soap bars from the mold, put them in a plastic container, and place them in the fridge.

Now that you’re done making breastmilk soap, feel free to get one and use it whenever!

Step-by-Step Guide for Cold Process Method


What to prepare:

  • 81 grams of frozen breast milk in an ice tray
  • 50 grams of lye
  • 11 grams of essential oils
  • 72 grams of coconut oil
  • 288 grams of olive oil
  • Plastic container
  • Glass container (bigger than the plastic container)
  • Ice cubes
  • Mold
  • Cutting board
  • Stick blender

Step 1: Give it an ice bath and add the lye

Get your plastic container and glass container.

Put the frozen breast milk cubes into the plastic container. Then, put some ice in the glass container.

Now, place the plastic container filled with frozen milk inside the ice-filled glass container.

Next, start stirring the milk while adding small quantities of lye.

Soap-maker Celine from Tweak & Tinker says that this technique will lessen the chances of the mixture getting scorched.

Continue to stir for 5 minutes to ensure the lye is dissolved. Then, allow it to cool down.

Step 2: Add oils and blend them with the lye solution to make a soap batter

Pour your coconut oil into a bowl. Make sure it is melted either through your microwave or over low heat in a water bath. Add your olive and essential oil to it.

Once your lye solution and oils are cooled, combine them using a stick blender.

Continue the process until the mixture starts to form a “pudding-like consistency,” as Belly Belly puts it.

Step 3: Place the batter in the molds and prepare for curing

Place the soap mold on a cutting board, then fill your molds with soap batter.

Referring to this breast milk soap DIY tutorial on Tweak & Tinker, release the air bubbles by tapping the cutting board with the mold.

With the soap batter still in its mold, put it in the freezer overnight.

Remove your soap from the freezer the next day. Leave it at room temperature for 24 hours then take the soap out of the mold.

Finally, let the soap cure for 6 weeks.

Note: Lye is an ingredient that can harm your skin so it is best to work in a well-ventilated area as recommended by Rebooted Mom.

When you make soap from breast milk with lye, make sure to wear goggles, rubber gloves, and a long-sleeved shirt.

Frequently Asked Questions


Cold process or melt and pour: Which one is better

Both techniques have pros and cons. Lye can harm you in different ways, so I shared the melt and pour technique in addition to the cold process.

This document from Delaware Health and Social Services explains that lye can “eat away” any part of your body. Hence, you need to know how to handle it carefully.

But regardless of the homemade breastmilk soap recipe or technique you choose, you cannot do it without lye.

Melt and pour is a safer option for first-time soap makers as it involves using a readily available soap base. The only catch is that the mother’s milk soap will have a shorter shelf life.

On the other hand, this Sugar and Spice blog points out that using the cold process gives you full control over what you want to put in your soap.

Can I buy breast milk to make soap?

Technically, yes since this kind of trade is not illegal. But keep in mind that buying or selling breast milk is also unregulated.

Another important point to remember is that making breast milk soap is not against the law. As you can see, many moms with an oversupply of milk have been doing it for the past several years.

However, in this article on Romper, writer Yvette Manes points out a possible risk of transmitting diseases if the milk came from a person with poor health.

When buying breast milk from a stranger online, it can be hard to find out the supplier’s health status. Hence, it is best to use your own breast milk or obtain it from someone you know.

What is a soap base?

Basically, it is a bar that contains all the soap’s raw ingredients, including lye. If you want to skip the saponification process, then get a soap base!

It shortens the hours spent crafting mothers’ milk soap and allows you to choose from a wide variety of soap ingredients.

To make breast milk soap with oatmeal or shea butter, for instance, you simply buy a soap base containing these ingredients.

Moreover, you can take advantage of the health benefits of these ingredients.

Shea butter soap base for breast milk soap is good for eczema. Obtained from fats, this fatty substance has plenty of other medical benefits.

Furthermore, it is commonly used in cosmetic products due to its antioxidants and anti-inflammatory properties.


Once you learn the basics of how to make breast milk soap, you can experiment with a broad range of ingredients.

If you check out the catalog of your local soap-making supplier, you will find a wide variety of soap bases that you can use. Even better, you can play with different essential oils and exfoliants.

Just follow the guide above, and you will be able to craft your breast milk soap without a hitch!

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