My son was 1 month old for his first Christmas. We bought him a baby gym thing because the one from our first son had broken. I know he got a few other things like a jack in the box from my sister but we didn't buy much at all.

ETA: I figure you can buy presents for up until the next birthday... so if they'll be 9 months old at the next birthday then consider any musical toys, push trolley walker things, anything they may use before that age.