My friend has a 9 week old ds. She recently visited her health visitor for a check and explained to her that her ds is drinking sometimes 8 ounces and still wanting more and drinking every 2 to 3 hours. The hv suggested putting him on the hungrier baby milk but is there not negative effects of this? I'm sure i have read somewhere on here that it causes constipation. Could he not be just going through a growth spurt?