Aiyoh, if baby gaining weight faster than expected, first thing is check with your pediatrician lah, they can plot it properly on the growth chart and make sure everything is on track, sometimes babies just grow in spurts and it's totally normal! A few of us mums noticed our babies looked bigger for their age but doctor said semua okay je, so don't stress first, just get professional eyes on it to be sure, especially if you're worried about overfeeding or anything else.