Sirenomelia

[Justme68]

What are the odds of this happening twice in a pregnancy.

Twice is a pregnancy? Do you mean if the woman is expecting twins? It's found 1 in 100,000 live births and believed to be linked to diabetes in the mother. If you're worried this will happen to you, please speak to your doctor/the medical professionals you are dealing with.

Do you mean happening a second time in a separate pregnancy? It’s impossible to happen twice in the same pregnancy unless as pp said it’s multiples.

Sorry I ment second pregnancy.