32months - persistent open anterior fontanelle and high myopia

[grey_girl]

My 32 month old has been followed by a pediatrician for short stature (~5th percentile) and a persistent open fontanelle for the past 8 months. My son has more recently also been diagnosed with high myopia (approx -7 in both eyes). I have been concerned with no testing done for the fontanelle to rule out causes. The ophthalmologist has confirmed that high myopia like this in a child this age is very unusual and usually seen in a child with a syndrome or who was premature (he was not). He is developmentally normal otherwise.

What testing is prudent here? Do you know anything that may link the short stature, persistent open fontanelle, and high myopia?