I'm concerned now but..

I started Lucas on solids a week ago. On Saturday I gave him rice cereal with banana for breakfast and haven't had a dirty nappy since. Since then I've given him pear & apple to try and get things movingbut nothing so far. When should I start worrying?

Even when exclusively breastfeeding he was going at least once a day, so nothing for 2 days concerns me. I'm not overly keen to smell a solids nappy but I want a happy healthy boy.