oh dont't worry, it's just a growth spurt. dont't worry about him getting obese. my 15-week old son is like your son when he was 8-week old too. we gave him pacifier when he started to make noise about 2.5hrs and only gave him milk when it's 3hrs. also 150ml. now he's drinking 180ml every 4-5hour. he was 64cm and 7.1kg when he was 13 week old.