He scored 103 not out in the first of these matches, and made starts in each of the following matches, reaching double figures on each occasion, but not scoring higher than 28. Two months later, Buttler made his England Under-19 debut, appearing in the first T20 against Bangladesh Under-19s. Playing as a specialist batsman, he scored 33 runs off 17 balls as England won by five wickets. During the 2009–10 English winter, Buttler toured with the England Under-19 team. He joined up with the squad in Bangladesh following Somerset's elimination from the Champions League Twenty20 for the seven-match youth One Day International (ODI) series, playing again as a specialist batsman. He failed to make a significant impact until the final match when he top-scored for England with 42 runs. He remained with the team for the Under-19 World Cup, where he played all but one of England's six matches, keeping wicket in three of them. He scored 91 runs in three innings, with a top-score of 78 against India in the fifth-place play-off semi-final. His batting average of 30.33 ranked him fifth on the England team. Buttler was called into the senior England squad for the Twenty20 International (T20I) against the touring Indian team in September 2011. He made his debut for the side in the match as a specialist batsman before going on to play against the touring West Indies side later the same season. During the winter of 2011 he was part of the England performance programme for batting and wicket-keeping in India, and played in the England Lions tours of Bangladesh and Sri Lanka, scoring his maiden limited-overs century against Sri Lanka A in January 2012. He played a T20I against India in Kolkata and then toured with England to play Pakistan in the United Arab Emirates in early 2012, making his ODI debut, although he was out second ball without scoring. Buttler continued to play regular T20 cricket for England throughout 2012. Against South Africa at Edgbaston, he joined Somerset teammate Craig Kieswetter with England on 64/3 with only 16 balls remaining. The pair gave "a brutal display of power hitting", raising the final score to 118/5, with Buttler hitting 30 runs from one 32-run over from Wayne Parnell, the second most productive over in International T20 at the time. The innings established Buttler as a key part of the England one-day side; he had made 10 appearances before the match but reached double figures only once in his six innings, and his performance made him "one of the most talked-about players" in the England side.