My baby is 5 and a half months old and still only taking roughly 4oz a formula per feed. I always offer 5 but it's rare that she'll drain a 5oz bottle. Other babies her age are on 7oz bottles now (which is also what guidelines suggest they should be taking at this point). She still feeds roughly every 3 hours during the day and wakes once during the night for a feed. She's putting on weight but is measuring small for her age and I guess I'm just a bit worried about the volume she's taking. I can't force her to take more milk though. HV didn't seem too concerned and said she's a little and often baby but is this normal? I'm wondering if there's anything else I can do.