Four Days Baby Sweater

Now it can be told. The men in my household are all taciturn. It's hard to get vital information out of them.
James came home from school in early February and mentioned that one of his favorite teachers, a mentor, had departed for paternity leave.
That was all the information I got. No gender, no name, nothing. I went to my "gift" stash and found a pair of baby legwarmers. Not right. I searched through my yarn stash for gender neutral yarns and settled on a navy blue acrylic. I four days, I completed a sweater/jacket in the 6 mos-1 year size. I actually looks good.
Present delivered and I think the recipient was both surprised an pleased. I'm determined to knit a small stock of these to have ready. My only problem is choosing colors. I get totally indecisive about color choices for babies. I want to choose something other than the traditional pink/blue/green/yellow. What works?