1 If the baby is fussy because of something in your breast milk, it is most likely protein from cow’s milk that passes into your milk. 2  Eliminating dairy or other allergenic foods like peanuts, wheat, eggs, or soy may help, but it’s hard to tell. When your fussy baby does latch on and settles down you get a rush of oxytocin, the ‘mothering’ hormone that helps you relax as your milk lets down. 2  Suddenly life is good again. 3  Let her use you for a pacifier and nurse for comfort. 4  If nursing doesn’t work, you or dad can let her suck your clean finger, pad side up.