When TurboTax asks if you had a baby this year, the answer doesn't go on your tax return. TurboTax is just trying to tailor its questions to your particular situation.
How you answer the questions, and how you handle the baby on your tax return, depends on your living situation. Do you, your fiancé, and the children all live together? If so, and your fiancé is going to claim the baby as a dependent, just leave the baby out of your own tax return altogether. In that case you can tell TurboTax that you did not have a baby, so it won't ask you any more questions about the baby.
If you and your fiancé do not live together, then how you handle the baby on your tax return depends on which of you is the custodial parent. The custodial parent of the baby is the one that the baby lived with for more than half the time that she was alive during the year. Which one of you is the custodial parent?
