How much does a 7 month old drink/eat in a day. The reason i ask is because i breastfeed so i dont really know what my dd gets other than when i work and she drinks pumped milk, and i have to have surgery on feb 7 and need to have a guesstimation on how much milk i need. If i have to suppliment i will, but i would rather not if i can help it. That is just my choice. Also before this starts if you dont agree with someone dont respond i really need help with this.