A.D.
That is actually great spacing between the kids! My kids are 2 1/2 years apart almost to the day and my first is a daughter and second is a son. They ADORE each other, and my daughter has been a huge help! I was shocked! I honestly think, after the first couple months, that having 2 has been easier than just having one, because they really do love and entertain each other. Watching them laugh and hug is priceless! I'd say go for it! Oh, and my husband is in the military and away a lot, and when he is home, I still do 99% of everything at home. It can be done!
If you really don't feel able to handle it, please consider adoption rather than termination...