I haven't found out with either this or my DDs pregnancy. I don't think it would have increased any 'bonding'. However, i find that most of my 'bonding' happens once bub is here anyway. The sex isn't the main identifying thing of the baby to me- their movements, their features, their behaviours are features that i find leads to greater 'bonding'- some of these i get some indication of during pregnancy but others only happen when bub is here and i can see and hold them.

Similarly, i can understand that partners may 'bond' less with the baby during pregnancy, and moreso when baby has birthed. I believe this is ok too.