One Sling, Five Positions. The Smile is an exciting reinvention of ur multi award-winning, 5-in-1 baby sling theBabaSling. Ideal for babies aged 0-24 months and weighing 3.6 to 15.9kg), this beautiful, hammock-style sling supports five different carrying positions, including two for discreet breastfeeding. Also includes an illustrated Babywearing guide.