We are concentrating on the early weaning irritability connection, but no one seems to have picked up on the early weaning connection to childhood obesity.
Breast milk contains all a child needs, and the balance is altered to satisfy your child, if they are hungry a creamier texture, if they are thirsty a watery consistency.This mean babies only get what they need.
Why would you complicate this and feed them something alien (if you are going back to our ancestors we would be eating chewed up dandelions, turnips, wild boar and fox - how many bananas, avocados and rice plants in the UK?)you are putting stress on the digestive system.
My son became a grazer through late weaning, it was great, he only ate what he wanted when he wanted, and we didnt fall into this trap of competitive "ooh my son's on potato now" malarky.
There are also theories about developing sweet tooth in the US where they are now denouncing apple and carrot mush because they get children used to sweet tastes and don't actually contain enough calories to make a nutritional contribution.
I don't suppose it makes a difference to bottle fed babies, because they are ingesting "alien" foodstuffs in a way since birth.
To the other poster who was fed Carnation - so was my husband, watered down in a bottle. His teeth are like a row of condemned houses, and if he eats cheese or other proteins he wakes up in the night throwing his guts up.