Some of this is usually attributed to selective abortion which probably less prevalent in Lakewood. Despite this, Lakewood has a somewhat higher than average discrepancy.
Selective abortion explains the much higher male births in countries like China, but is not that common in the US. (Selective infanticide has also been suggested to occur there.)
More male than female births has been found historically in the US as well, before selective abortion was an option. It can be influenced by external factors, such as stress, wartime, poor nutrition, which can lead to fetal death. I think the male fetus is more sensitive to these, and that more females are born under these conditions, but I haven't looked into that. GIYF.
In any event, it seems to me that the numbers graduating high school would be more useful and shouldn't be that hard to come by.