My DS is 13m and been breastfed, tried and failed to get him on to formula / bottles but now he's struggling to settle in nursery (ie had 8 w of trial days, been phoned to come and collect within 1-3 hours as screaming inconsolably) and they think him not having a bottle isn't helping.
He has a 7am and 7pm feed and would only have 1 more day feed max (1pm before nap although today had none).
I want to go back to work but can't make plans as can't rely on him being in nursery 10 hours, which he'd need to be. My DD whose 3 settled in the same place fine, but would take a bottle from 8w although was breastfed for a year.
Try offering him milk in a cup with/without straw, this helped me with all of mine, all were over a year old and none took a bottle! (Although they second one wouldn't take any milk, and never has, doesn't like any milk based products-even ice cream!!!)