Please help. So confused.

LO is 6 weeks plus. She has been drinking lesser from previous weeks, she used to drink 120ml per3hour now only 60-90ml per feeding, frequency is still same 3-4 hours. Is this safe?? She has been sleeping a lot in the afternoon and fuss a bit at night, want me to carry and hug her to sleep. What time before bed you guys will keep them awake and any activity? Tried to keep her awake from 6-8pm but sometimes it’s difficult. Can anyone please share if have same difficulty or have diff story please.