These percentiles that you record here are for weight-for-length? Then yes, I'd agree that this needs to be worked up further.Given that all this has been post birth, this isn't from any kind of nutritional deficiency during pregnancy
Thank you for responding!Weight for length curve doesn't look great, even to a layperson like me.I do think the numbers here are can in part be explained by the fact that the legs that were withered and disproportionately short at birth seem a lot more proportionate to overall body length at current time. Based on photos, I would guess that this was a visible change by 6 weeks. IUGR diagnosis was asymmetric, with normal enough head and torso with shorter arms and significantly shorter legs (legs measured for 32 weeks at last growth scan prior to birth).So ... leg length caught up a little, but weight did not rise at the same rate.WHO Boys 0-2 Percentile goes:43 at birth1.9 at 1 months3.3 at 2 months1.8 at 3 months0.96 at 4 monthsCDC Boys 0-36 months Percentile goes:60 at birth2.5 at 1 months3.4 at 2 months2.2 at 3 months1.2 at 4 months