Babies given solid foods before they are four months old are more likely to become overweight toddlers.
The study from University College London (UCL) also found that children who were not breast-fed were more likely to be overweight.
Living in a lower-income family and having a less educated mother also made children more likely to be overweight, accordingt o the UCL study.
Meanwhile, another study found that reading to three-year-old children every day puts them more than two months ahead of their classmates in literacy and maths by the age of five.
A University of London study found that reading was more important to a child's academic development than teaching the alphabet or how to count.
The findings show daily reading sessions also help children's knowledge and understanding of the world.