How wonderful!! You'll be an aunt again!!
My dd just had a boy in NOv. and he is our second grandchild. Her first child was a girl..so we have one of each and are thrilled. All the more reason to KNIT.
Congratulations! You are so lucky that they wanted to know what they baby was and you can get a jump on the knitting. I have 3 babies to knit for and none of the parents want to know. I would love to knit little girly or boyish things instead of unisex. Thank God for primary colors!