Pg 77/91 Gnome doesn't specify if the listed attributes maximums include the modifications for Neoteny
Pg 91 Pixie weight seems like a lot for their height - random googling says a 3-month old male baby averages .614m and 6.4kg - about the same height as a pixie, but 1/3 the weight. In general I think maybe taller metatypes have a lower weight than I'd expect and shorter metatypes have higher, but pixies and gnomes are the ones that really stands out