Guess this babies gender? Skull/nub theory

Brandi • Have 1 little girl who was born June 2015 and now pregnant again with our second! Due in December ☺️
Top picture is from my daughters 12 week scan. Bottom picture is this pregnancy at 13 weeks with our new baby :) based on skull and nub and comparing it to my daughters scan (top one) what gender do you think this baby is? :) 

Vote below to see results!