Girls, we're 2.5 months old, the baby doesn't sleep long at night ofte…

Girls, we're 2.5 months old, the baby doesn't sleep long at night often wakes up or falls asleep too late, for a strong sleep, for example, it sleeps soundly at three or four in the morning and then sleeps all day, but before that it sleeps for five minutes, what to do? How to set up the right schedule?