Girls, hello! I have several problems. My four-month-old daughter star…

Girls, hello! I have several problems. My four-month-old daughter started waking up very often at night. She used to sleep all night. At 10 she would go to bed, once woke up at 5 am to eat (we're on GIV), and then slept until 8-9 o'clock. But for the last week, she has been waking up every 1.5-3 hours. And in this month she gained 400 grams. Although the previous months she gained 1100, 700, 700. I think my milk supply is low. But sometimes it can be oversupply. I don't know what to do