you will know when u need to increase a solids meal or add another. Bubs dont lose their iron smack bang on 6 months. It does get a little lower around 9 months tho. I have not bothered with rice cereal. Tho we have done more BLS so even if i tried, i dont think she would eat that now. There are other foods that are high in iron, so mayb look at these on google? U may find that the rice cereal will make him constipated, it tends to have this affect. My DD is on 1 solid meal a day atm. But has fingers on fruit and bits and peices through out the day.

HTH