We had our DD christened at 3 months, both me and DH are christened in the same faith, we married in the church and I practice religion, I dont go to church every Sunday, but I do go occasionally and for us it was important to have our child officially accepted into our faith. Its a matter of personal choice, and if you feel its right (for whatever reason) then go for it, and if you cant decide just yet, you dont have to do it when they are little tots either, my mum was christened at 12!