How long does it take for my milk to come in?

2-3 days
Milk “coming in” generally refers to the time when the mother notices increased breast fullness (and other signs) as milk production begins to kick into full gear– this usually occurs 2-3 days after birth, but in as many as 25% of mothers this may take longer than 3 days.

Why is my milk taking forever to come in?

This is a sign that your milk supply is increasing and changing from colostrum to mature milk. Your milk may become whiter and creamier, but this varies between women. If your milk takes longer to come in, don’t worry. This is normal and usually isn’t a cause for concern, but let your doctor know.