Hello everyone. The baby is turning 11 months old in a couple of days …

Hello everyone. The baby is turning 11 months old in a couple of days and he's already refusing his second nap for four days now. He sleeps 1-1.5 hours, rarely 2 hours during the day. And how can I get him to sleep through the second nap, he just won't sleep, and it's getting late anyway. Won't it be harmful if he sleeps so little during the day?