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The fact that the baby has a talipes ('positional' i.e. treatable by massage & physio or 'structural' ie requiring corrective surgery) does not affect it's birth in any way, breech or cephalic (head down), it's irrelevant. It is no impediment to a normal birth at all. In the days before we scanned everyone obsessively the talipes just turned up as a surprise package at the end of a usually normal vaginal birth.
If they were severe it may possibly prevent the baby turning from breech to cephalic but it's doubtful. That's because the baby uses it's legs & feet to help itself turn (imagine a rabbit in a transparent water filled balloon doing somersaults that will give you the 'visual').
The major influences that affect whether a breech baby turns or not are:
1. 1. Multiple pregnancy with or without associated prematurity i.e. fetal size & babies are commonly breech at 28 - 32 weeks anyway.
2. the position of his legs i.e. extended alongside his head (frank or extended, most common) in which case he will find it nearly impossible to do a somersault forward or backward especially as he gets bigger & there is less room to move ( his legs act as a splint to his body, we cannot do a forward or backward roll with a straight trunk, we must curl up to achieve it. If you get a doll & do the visual with 1 foot beside each of the dolls ears you will get the drift). As opposed to flexed/complete breech where he is sitting cross-legged in the bottom of the uterus (or footling where feet or knees present)& can bend his trunk to somersault
3. Abnormally shaped uterus i.e. bicornuate or baby with abnormalities (NOT including talipes).