is this it?

My baby girl is 19wks and just this week she has gone from being able to be put down for naps to ONLY napping after nursing and in my arms. She wakes up the minute I put her down, unless we are out and about she's in the car seat. 😭 She is waking up about every hour and a half to eat at night.... 
This must be the 4month sleep regression the mommas are talking about. So how long will this last? The nighttime feeding aren't as bad as the no napping!! I need those naps to cook & clean!! Lol