Good luck to your sister :) Hope she ends up getting the support she needs from her child's father!
Wow she just found out she is due in 13 weeks. WOW! I have to agree with all the other posters, but with that being siad I can agree with your concerns aswell. Well I wish your sister luck and just remember this baby is a blessing as well!
sl629 - It doesn't sound like she made this decision, it sounds like she wasn't thinking. Or was thinking about her sick baby.
Like Griggsy said, no point in sawing saw dust... I know what you mean about being frustrated though, my SIL's little sister is having a baby after having an abortion less then a year ago... I'm glad she's having this baby, don't get me wrong. But she could have not had the abortion and kept her other baby. You would think they would learn. All you can do is help and do what you can for these babies... GL to you and your family.
Have you talked to her about your concerns? Are you encouraging her to make better decisions? If you are concerned and want to help, you should talk to her and get in her head to see why shes made this decision.
No need in sawing saw dust. What's done is done. People make mistakes, and you just have to be there for them to help and forgive. I'm sure she was just as surprised by the whole thing as you were, but it'll work out.