I had a baby a month ago and he was 7 lb 7 at birth. He lost more than 10% in the first few days and whilst he started gaining weight we had a blip where he lost a little (or inconsistent scales said he did). Since day 11 he has only gained weight/stayed the same. He had a tongue tie snipped when about a fortnight old. Today is day 32 and he's 7lb 2. He's been combination fed, generally 2 bottles a day (1-2 formula, 0-1 expressed) and everything else breastfed. He seems alert and lively when awake. Midwife is encouraging me to persevere on the same regime and to express as much as I can to increase supply and be able to ditch formula (which I think gives him a bad tummy).
What I don't know is how slow can weight gain be acceptable? My baby has gone from the 9th percentile two weeks ago, to 5th last week and is now on/under 1st. What's the plan B? When should I be concerned?