Feel like crying

Bri • Married and mother to babygirl💓

What happened ? My baby used to sleep all night since 6 weeks for 10 hrs a night . Now ... she’s 4 months and she’s waking up in the middle of the night and i have to feed her for her to go back to sleep . Why did she just out the blue start doing this ? What can i do to change it? So not used to it and then i feel like baby is sleeping more during the day to catch up .