Anyone else have a babe who slept GREAT for the first few months and then ever since 4 months wake up 3 or 4 times a night?

My little girl started sleeping in a rock n play sleeper and loved to be swaddled, we transitioned out of a swaddle at 8 weeks old. She continued to sleep in a rock n play sleeper thing for another 3 weeks then a pack and play in our room for a week before transitioning her to her crib in her own room at 12 weeks old.... she did fine in her rock and play sleeper but as soon as we moved her to a flat surface she will not stay sleeping more than a 3 hour stretch’s! At first I thought maybe she wasn’t getting enough to eat, so we tried cereal for a few nights but it didn’t change her habits, I spent money on a nested bean sleep sack hoping that the light weight of the egg shape on her chest would help and that didn’t do anything for her... I don’t really know what else to try right now and I’m getting desperate because I start a full time job next week! I’d be okay with getting up once maybe even twice but 3/4 times a night is making me a mombie!

Me and my late night partier 😊