I neglected to mention that folks can and do determine neonate sex by dissection or with the use of an endoscope. I looked into it a bit further and the data seems to suggest that sexes for a clutch would be 50/50 as I suspected. The source did not actually give any specifics for each clutch though. Rather, several clutches were probably lumped together and then eggs were selected at random for different temperature trials. Nevertheless, based on their results it appears that an approximate 1:1 ratio is probably present in each clutch.