Not sure what to do

Hi my son is 12 weeks old and only has about four bottle in the day between 6-7 oz and sleeps through the night with out waking not only that sometime he can be sick a little after bottles but to day he has only had 3 bottle and hasn't woken for his fourth bottle I'm a little worried to what to do. Then he was 6 week old he weight 10.7 not sure of his weight at the moment as haven't had him weighed just yet is this normal or should I talk to the health visitor about his feeds