Both AliBB and Joshua also speak in English but I think the number of vocab that AliBB has learnt are more than Joshua... coz he likes to 'listen' than 'speak out'...
Interestingly, when I visit the babycentre webiste (www.babycentre.com) and surf the article talking abt the toddler's development @ 16M old, we find that we've already gone through all the 'games' it suggested to play with 16M toddler when Joshua was only 14-15M old.... so both of us think our little Joshua is a 名副其實既 '玩玩小豬B'