I agree with the others. You don't get rid of one child just because you have another time consuming one coming. You made that commitment with your grey, and they really are like your child. Please re-think, don't give up so easily, and take your time. You may find that it won't be as difficult as you imagine. After all, you have never been a parent to a "human" baby, so you don't really know first hand what you are able to handle or not handle. Don't let others (family, friends) who aren't in your shoes, dictate what you should do with your grey.
Wait until your child is here, give it plenty of time, and you might just be surprised to see that it really won't be so difficult after all. B)