u/PaleontologistDry917

My 5mo has been in a sleep regression for the past 3 weeks. He’s waking every hour and a half through the night (before this he was sleeping through the night so well from 3 months 😩) I’ve tried to hang in there but he gets very upset and sort of angry cries on the breast, clamping down and pulling back and on very little sleep I’m finding it hard and getting sore nipples. Also can’t sleep during day due to having another child so have introduced a bottle of formula tonight has anyone had any success with this?
He takes bottle well as has had them with expressed milk since birth on occasion but I make “just enough” and pumping has been gruelling