Constipation....

No, not me you sickos!!!!
Did any of your babies get constipated when you started them on cereal. Adriana has been on it for a little over 2 weeks or so, and she did fine at first then a couple of days ago she started getting a little constipated. I now put some plums or prunes in her cereal, and it helps a lot. But do they eventually get over that, or am I going to have to add prunes/plums forever? Also....Would it help to use oatmeal cereal instead of the rice cereal? Because she's been on rice long enough to have oatmeal...But I was going to try and keep her on rice until she hits the 4 month mark. I appreciate any info anyone has!! =)