Girls, question about daytime sleep. We're almost 4 months old, and da…

Girls, question about daytime sleep. We're almost 4 months old, and daytime sleep is 2.5-3 hours. Mostly 1 sleep lasting 1.30, others for 30-40 minutes. And night 10.30-11.30 hours. Question in what, according to the table, the child sleeps much lower than the norm for his age. Has anyone had something similar or is it happening now? I can't decide if we should extend the naps.