The normal value of weight for 9-week-old children corresponds to their height. 9-week-old boys generally have a height of 135.4cm and a standard weight of 30.46kg. 9-week-old boys’ weight is within a standard deviation of 26-34kg, which is considered roughly normal, and the corresponding height is 131-139.3cm, which can be dynamically observed and considered roughly normal. 9-week-old girls’ standard The height is 134.1cm, so the standard weight of a 9-week-old girl corresponds to a height of 28.19kg. girls, like up and down within a standard deviation, are considered normal at around 25-31kg.