I started at 5.5months and she was on the 50th centile. I started because the child health nurse said she was going to become anaemic being on only breast milk that long and needed the extra iron in the rice cereal, so i panicked and started it straight away. The consistency when mixing with milk has to be very runny initially. I then got over-excited about starting solids and within a couple of days I started giving her fruit and veg. Long story but I later came to realise that that nurse didnt know what she was talking about , and this time wont be starting anything until 6 months if baby is doing well on milk alone. I think with preemies you dont correct for age as their iron stores start to run out.