Day time napping for my 15 week old?

I put my 15 week old son into his own room to sleep last night and he is sleeping like a trooper since he went in. He slept from 10pm last night til 6.30 this miorning. Then slept after his 7an feed til 11am. Fed then and woke again for food at 2pm. Is he slpping too much??? How many naps are reccommended during the day at his age??? I dont want him to sleep too much during the day and end up awake all night bacause of it. Any advice????