My ds is now 4 months old and has slow weight gain from the start. We asked for a referral to a paediatrician and tests have ruled out more serious underlying conditions.
I'm worried because the paed is very gung-ho about wanting to admit him as an in-patient soon to monitor his feeding (and mentioned stopping bfing and giving him formula to see how much he's taking in), but I don't feel in my gut that this is necessary if weight gain is his only problem. Am I deluding myself?
He was born full term on the 25th centile at 3.24kg (7lb 2), hit 3kg at the lowest point, and weighs 4.65kg (10lb 4) at 17 weeks, which is below the 0.4th centile. His average weight gain has about 100g per week, and he has always gained steadily if slowly. He is more or less tracking a curve below but parallel to the 0.4th centile for the last 5 weeks. He had a tongue tie snipped at 3 weeks, and a nasty dose of thrush after that, but his rate of gain didn't really change afterwards. Breast compressions, extra feeds, switch feeding, domperidone, topping up with my expressed milk haven't made a dramatic difference either. We even started topping up with donor milk (via hm4hb) when the paediatrician insisted on supplementation, but it also hasn't made a huge difference.
However.... His length and head circumference are tracking the 25th centile no problem. He feeds on demand about 12 times a day - including 3-4 feeds at night - and seems contented after feeds. He is bright and alert with a lovely mischievous grin, is active and strong, and is nearly able to roll back-to-front. His fingernails are growing. He has plenty of wet nappies and poos 1-3 times a day (though they have been more green than yellow since he had a bug last week).
Can a healthy baby show this pattern of weight gain? In the "look at the baby, not the scale" sense, I wouldn't have been worried if I hadn't seen how he plots on the growth charts. My GP and the local infant feeding coordinator both think he seems fine if a bit skinny, but tend to defer to the paediatrician's judgement. 