Pregnancy and Parenting

Authenticity of a hadith regarding duas being accepted during childbirth/labour

Q: I came across some information a few years ago, which I don't remember the source. I am now pregnant alhamdulilah and I would like to verify this information as I cannot find anything in my Islamic literature.

Is true that dua is accepted during childbirth/labour? If so, please can you provide any basis.

Child remaining in the womb of the mother for more than 9 months

Q: In Behishti zewar theres one masala that states that if a husband passes away and then after a year the lady gives birth to a child, it will be attributed to him (she didnt get married again at all after his passing). Conception happens a few days as afterwards the nutfah dies and conception is only 9 to 10 months.

Is it normal for a mother to carry an offspring for 12 months?