They may be innocent play buddies for now, but there's every chance love will eventually blossom for at least some of these toddlers.
As youngsters put on a concert to celebrate the 20th anniversary of Buttercups Nursery in Isleworth last Friday, owner Carol Whitehouse revealed the remarkable story of its romantic past.
Her own son David and long-term girlfriend Dawn Sutcliffe are one of a string of couples for whom Cupid has struck at Buttercups or one of its five sister nurseries.
They were just three when they first met at Buttercups Nursery in Chiswick, though it would be another 13 years before they finally got together at St Benedict's High School in Ealing.
They have now been together six years and they're not the only success story from the Buttercups chain.
Nursery worker Celia Manchester tied the knot with caretaker husband Roy after meeting him at Chiswick Community School, where the Chiswick nursery was briefly based.
And Sophie Smith met her husband James while working at the Isleworth nursery, based at Isleworth Explorers' Club in Twickenham Road, where he was a youth worker.
Mrs Whitehouse set up her first nursery in Chiswick in 1980 after growing frustrated at the lack of places for her second child.
"I always knew I wanted to work with children but I never dreamed I'd have six nurseries one day," said the mum-of-five.
Buttercups in Isleworth recently won a Pre-school Learning Alliance Accreditation Award for its work training young carers and was rated 'good' by Ofsted inspectors earlier this year.