How Thick Should Layer of Fat in Breast Milk Be? Find Out Here!

Breast milk is often described as liquid gold due to all of its many benefits for infants. It’s filled with nutrients that not only nourish and satiate your baby, but it also provides immune-boosting and growth-producing benefits. One of the crucial components of breast milk is its fat content, which plays a vital role in your baby’s growth, development, and overall health. Moms who pump breast milk can see this breast milk fat by way of a layer of cream that develops in a refrigerated bottle of pumped breast milk. This leads many moms to ask how thick should this layer of fat in breast milk be? In this article, we’ll delve into the factors affecting this thick layer of fat in breast milk and determine how thick that layer should be.

How Thick Should the Layer of Fat in Breast Milk Be?

There is no specific measurement or standardized thickness that defines the ideal fat layer in breast milk. The fat content in breast milk is typically measured as a percentage of the total milk volume. On average, mature breast milk contains approximately 3.5% to 4.5% fat. However, values can vary among mothers and even within a single breastfeeding session if you breastfeed or pump from both breasts.

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Rather than focusing solely on the thickness of the fat layer, it’s more important to ensure that your baby receives an adequate amount of overall breast milk to support their growth and development. Monitoring your baby’s weight gain, observing signs of fullness after feeding, making sure baby has enough wet diapers, and regular visits to a pediatrician for growth assessments are necessary in determining if your baby is receiving enough breast milk.

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It’s also important to keep in mind that breast milk is a dynamic substance. It adapts to the specific needs of your specific baby. The composition of breast milk changes over time and throughout a feeding session, providing different nutrients and benefits. Therefore, instead of fixating on the thickness of the breast milk fat layer alone, it’s essential to focus on a holistic approach to breastfeeding. This means ensuring:

  • Baby has a proper latch and/or you are using the correct breast pump flange size
  • Feeding or pumping frequently enough
  • Ensuring baby or breast pump empties your breast(s) adequately during a feeding or pump session

Why Doesn’t My Breast Milk Have a Fat Layer?

It’s perfectly normal if you do not have a visible layer of fat in a bottle of pumped breast milk. The fat in breast milk can naturally separate and rise to the top when it is refrigerated or left undisturbed. However, the absence of a layer of fat does not mean the milk is lacking in fat content or nutrition. I breastfed three babies until they were each 2 years old. All three of my babies grew like they were supposed to and met all of their milestones. I never once had a fat plug so thick that it plugged up a bottle. I can actually only recall two instances where I had a thick layer of breast milk fat!

Related article: Breast Milk Fat Separation – Why It Happens & What To Do About It

The fat content in breast milk can vary greatly between pumping sessions and even throughout a single feeding session. This is dependant on the amount of foremilk and hindmilk your breasts produce. The globules may not always form a distinct layer on top. The fat content in breast milk can be distributed throughout the milk meaning you may not see visibly observe it. Mixing the milk gently by swirling the bottle before feeding or running the bottle under warm water will help distribute the fat evenly.

Related article: Shaking Breast Milk – Does It Really Damage It?

What are the Fat Chunks in Breast Milk?

The “fat chunks” you may observe in breast milk are the same thing as the fat layer in breast milk. They are composed of milk fat globules and are natural components of breast milk that are responsible for the creamy appearance and texture you see–similar to cow’s milk.

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Milk fat globules are composed of triglycerides, which are the main type of fat found in breast milk. These globules vary in size, ranging from small to large, and their distribution can be influenced by several factors, including the age of your baby, a mom’s diet, and the frequency of breastfeeding or pumping.

The size and distribution of milk fat globules can change throughout a mother’s breastfeeding journey. In the early stages of lactation, the milk fat globules tend to be smaller in size. As your baby gets older and your breast milk transitions to mature milk, the fat globules become larger and more visible.

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How to Get More Fat in Breast Milk

As we mentioned above, it’s perfectly normal if you don’t see a thick layer of fat in your pumped milk. There IS fat in your breast milk! However, if you want to try and increase the fat in your breast milk, there are several things you can try which we have listed below. You can also check out our detailed article How to Thicken Breast Milk Naturally – 4 Effective Methods for a deeper dive into this topic.

Feeding Frequency

The frequency of breastfeeding or pumping can influence the fat content in breast milk. Typically, the fat content is higher in hindmilk. Hindmilk is released toward the end of a feeding session when the breast has been emptied more thoroughly. If you are pumping, you can try adding a pump session to your pump schedule or you can try power pumping.

Related article: Pros and Cons of Power Pumping – Everything You Need to Know

Time of Day

Research suggests that the fat content in breast milk may vary slightly throughout the day. Higher levels of fat are observed in the evening compared to the morning. You can try adding a pump session in the evenings before be. You can also try the middle of the night if you don’t need to feed your baby throughout the night.

Related article: Do I Need to Pump at Night When Baby Sleeps Through The Night?


A mom’s diet can impact the fat composition of breast milk. Consuming a balanced diet that includes healthy fats, such as omega-3 fatty acids, may positively influence the fat content. See our article How to Thicken Breast Milk Naturally – 4 Effective Methods for a more detailed breakdown on what foods are best for producing more fat in breast milk.

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The fat content in breast milk plays a crucial role in providing essential nutrients and energy for a baby’s growth and development. It’s important to note that every mother’s milk is unique and tailored to meet the specific needs of her baby. While some moms naturally produce breast milk with higher fat content, it doesn’t mean breast milk with less fat is inadequate. Breast milk is a highly nutritious and complete source of nutrition for babies, regardless of the fat content. If you have concerns about the fat content of your breast milk, speak with your healthcare provider for personalized guidance.

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Shannon founded Work Breastfeed Mom in 2019 during her second round of pumping at work. She was tired of googling the same pumping questions over and over again, and discouraged at the lack of websites aimed at working breastfeeding moms. So, she created one herself. Shannon lives, works, and doles out Puffs to her little people in sunny Florida. She has her MBA and works as a strategic planner for a large healthcare system. She is passionate about coffee, memoirs, paddle boarding, and skincare routines. Shannon is mom to Scarlett and Ivy, and hopes to have more babies if her career allows.