When youre out and about the non173 spill valve prevents unwanted spills and the big handles make it really easy to hold on to 173even one handed at home when a few dribbles dont matter its easy to remove the handles and non 173spill valve so they can hold the cup and practise free flow drinking which can help their oral development the soft spout on this cup is smooth and gentle on gums even during periods of teething and were also smooth and gentle on you all our cups a