For portraits, I did like the 50mm prime and the closeup you get on the crop sensor. But I have 3 kids from 10 months to 8 years and wanted something a little wider to get more of them in 1 shot. For 1 kids, especially a baby, give the 50 a try.

I think my next lens will be the 100mm L macro. I do think that would have been neat with the newborn.

Eric