Also generally, kids born from younger mothers are more healthy and with less defects than childs born from older mothers (where "young" is meant as younger than 35 years, and "old" is older than 35 years)
>We find that offspring born to mothers younger than age 25 or older than 35 have worse outcomes with respect to mortality, self-rated health, height, obesity, and the number of diagnosed conditions than those born to mothers aged 25–34.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3881604/