<prompt> Chance of subsequent baby having NTD when first baby was born with NTD -241020  <response>: Ans. is b i.e., 4The recurrence risk of neural tube defect is :3 - 5 if a couple has previously had a child with either anencephaly or spina bifida.5 if either parent was born with a NTD.10 if a couple has two affected children 