Yes, breastmilk composition does change over time. Early milk is different from milk at 3, 6, or 12 months. Those changes are fine-tuning rather than hard cutoffs. Milk made months ago still contains: ✅Carbohydrates for energy ✅Fats for brain growth ✅Proteins for growth and repair ✅Antibodies and immune factors ✅Enzymes and bioactive components Those core building blocks don’t suddenly become “wrong” for an older baby. Babies don’t require a perfectly matched milk profile for their exact age at