I think in Australia the official recommendations are to wait until 6 months to introduce solids, however my paed and nurse both recommended starting at 4 months due to new research indicating the delay in introduction of solids may be linked to increases in intolerances and allergies. I have been told with both children to introduce allergen foods eg peanut butter early (before 6 months) and include them in the diet regularly. I believe the recommendation is for milk first then solids around an hour later til around 9 months then at that age can start giving solids first. I was encouraged to start my children on meat etc before 6 months. DS (7mo) was never a good breast feeder and never happy or putting on much weight so on the advice of my chn I started him on solids about a week before turning 4 months - it was the best thing for him as he became a lot happier and started putting on more weight. He self weaned at 5 months and when I saw how little formula he was drinking (around 150ml in the morning and 40ml or less at the other 3 feeds) I was alarmed but neither the chn or gp were worried based on the fact he's putting on weight, is healthy, active and meeting developmental milestones.