I think my milk supply dropped! My son is almost three weeks old and he is acting hungry even after I just fed him. He is more fussy and isn’t sleeping as well. Could I be drying up?
Welcome to a growth spurt! Given your baby’s age and his behaviors, this sounds exactly like a growth spurt. Think back-- you may have even noticed he did this same thing around one week of age when your mature milk came in full swing (at this time there can be a mini growth spurt). Growth spurts are a necessary part of your baby’s development. Though they can happen at different times, the average infant has a growth spurt around 2-3 weeks, 6 weeks, 3 months, and 6 months of age.
Just as you’re describing, growth spurts will cause your baby to be more hungry, fussy, and either sleep less or more. Many moms worry during growth spurts they are not making enough milk for their baby. Keep track of your baby's wet and dirty diapers each day. If they have enough wet and dirty diapers, they are getting enough milk.
Spend more time skin to skin, and offer your breast more, even during the night. Watch your baby's cues and offer your breast as much as your baby wants. This will not only help your baby grow and develop, but it will keep your milk supply steady. Massaging the breast before and during feeding is a great way to increase milk flow during growth spurts.
If you are exclusively pumping breast milk for your baby, continue to pump consistently, even during the night. You can consider adding in one pumping session during the day when you notice a growth spurt as well as increasing skin to skin with your baby. Growth spurts can seem tiring at the time, but remind yourself they only last a few days! You can do it!
SOURCE: https://wicbreastfeeding.fns.usda.gov/cluster-feeding-and-growth-spurts