For the love of announcements
Of course you might also want to keep in mind that people will expect nothing but the best announcement since it is a time honored tradition. Having it customized, meaning it should be personalized, is the first thing you should do. The design you should choose therefore should speak your sentiments and joy. Since definitely you want a picture of your baby in your card, the design that you choose therefore should match your picture. For example, you can choose a sports theme if your baby is in his infant sports gear.