Sleep regression

My daughter is 3 1/2 months and we are struggling with the what I think is the 4 month sleep regression/4th leap if you follow the Wonder weeks. She used to sleep 7-10 hours a night with minimal wake ups for nuk/feeding. Now naps during the day are difficult and short and night times are full of needing nuk back in mouth and/or awake to eat/just restless... anyone else in the same boat? What are you doing? We are trying to keep bedtime routine consistent and she goes to bed just fine about 9pm