The girls are exhausted already. The baby's schedule is completely mes…

The girls are exhausted already. The baby's schedule is completely messed up. We go to bed at 11:30 PM and wake up at 7:30 AM. We put him down for a nap at 12:30 PM and 3:30 PM. He sleeps for an hour each time. We have been having this routine for five months now. It seems like his gums aren't swollen or red ? but he has everything in his mouth, from saliva to toys, and even tries to suck on his finger. He started crying literally today (mmmmm). I don't understand what it could be? ??