my baby is almost 12 weeks old. she was born with a birth weight of 2.35kg. i exclusively breastfed her for 2 months, then started supplementing with formula. i am now giving only formula. however, she will drink only a total of 500ml per day! she takes one 1hr-nap during the day, and sleeps for 9-10hours at night. even when i wake her up during the night for an extra feeding, she drinks only 30ml then goes back to sleep. i do not know if this is good or bad. i feel that the amount she is drinking is not enough, but she seems content, and does not want more. she refuses when i try to feed her more. help please!