Most people will agree that all toddlers are cute – but, as a group of photographers have undeniably proven, they’re even cuter when they’re tasting a lemon for the first time. Photographers April Maciborka and David Wile have compiled a series of photos of adorable toddlers sucking down lemons – and the priceless facial expressions the children make when they instantly learn what sour is.

The photographers went with a simple title for their project: Pucker.

‘Lemons can be a great source of entertainment,’ the photographers explain. ‘Especially when you give babies the opportunity to taste [them] for the first time!’

The babies’ reactions range from pained to confused to betrayed. In a few cases, the babies actually seem to enjoy the lemons.