baby sleep FTM please help

Alaina

im wondering if my baby sleeps too much? he goes to bed between 830-9pm sleeps through the night (maybe eats once or twice) wakes up at 7-8 eats, plays,eats again nap at 11 till 1230 eats again, plays eats again, naps at 2 sleeps till 4 than up till bed time. Is that too much sleep hes 4 months old we do tummy time, we practice sitting up i read tons of books, he just seems to sleep a lot. please help FTM