At the moment Connie is on 120ml. She is finishing the bottle but it takes her an hour or more and usually falls asleep every 30ml for 5-10 minutes then wakes, has a bit more, falls asleep again repeatedly until it's finished. She is wanting the full amount but as it's taking her so long to finish it I'm worried that the bottle is out for too long and could go off. She is hungry but just seems to get bored and doses off. How long should it take for a baby her age to do a bottle?