Pregnancies are much less common among girls younger than 15. In 2008, 6.6 pregnancies occurred per 1,000 teens aged 13–14. In other words, fewer than 1% of teens younger than 15 became pregnant in 2008.[6] Pregnant teenagers tend to gain less weight than older mothers, due to the fact that they are still growing and competing for nutrients with the baby during the pregnancy.[7]