Hello Baby is 4.1 months old Since 3 months he started screaming befor…

Hello Baby is 4.1 months old Since 3 months he started screaming before every nap, and now he's in shock with cries I can't take it anymore Talked to a friend, she says their baby does the same before sleep at 3-4.5 months I'm curious if this period is really something? I want to put him down calmly, get away from rocking, but I can't, he doesn't take sippy when he cries, I stop putting him down, he cries because he wants to sleep He calms down only after about 5 minutes, rocking on my arms and singing lullaby louder than his crying These "feeding, not feeding"