This is going to VASTLY differ based on how big your baby was at birth. My son was 5lbs 15oz at birth and he was 7lbs 13oz at a month. 7lbs 13oz is small for a 1 month old, but for my son it’s a 2lb weight gain which is right on track for him.
At 1 month, no clue.Daughter was born 6 lbs 4 oz, at 2 months she was 9 lbs some odd oz.Son was born 6 lbs 14 oz, at 2 months he was 12 lbs 7 oz. (For extra reference daughter is 4 now and 38 lbs. Son is almost 10 months now and 21 lbs.) Nevermind my face... She's doing some pose Mei Mei does in Turning Red.