How much should a 10 day old be drinking? Her feed is about 2.5 hourly apart. And her intake ranges from 100-120ml depending. Is it enough?

Wow, that's a lot of milk for a 10 day old! My baby was drinking around 60ml at that age. If you're bottle feeding, do be sure not to over feed your child. If you are direct latching, it doesn't matter as long as she produces wet nappies. If you are feeding breast milk in a bottle, you can feed slightly more as breastmilk is mostly water.