When I was there the end of Feb, it was in the 80's during the day, but cooled down in the evenings. We wore shorts and Ts during the day, and jeans and jackets at night.
As long as you pack appropriate clothing for your baby, you'll be fine.
We were there Feb. 6-18, 2005. It was warm somedays (shorts and t-shirts) and it was cold (and windy!!) somedays (jeans, sweatshirts, jackets with hoods for the kids). Bring a variety of clothes and you and your 6 month old will be fine. I like to do the layering thing...wearing a short-sleeved t-shirt over a long-sleeved one, then a sweatshirt and/or jacket as needed. For a 6 month old, if it's windy, a separate hat that covers his/her ears might be a good idea, and it would be a small thing to pack.
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