Parents who gave their child a Kidizoom smartwatch or a VTech InnoTab tablet may have exposed them to identity theft after Hong Kong-based VTech said hackers stole the personal information of more than 6m children.

Google has said that smartwatches based on its Android mobile software will be available later this year, enlisting a variety of partners and signalling the internet company’s intent to play a leading role in what could be the next big computing market.