We used a product called Aquadry (a towel for drying your car off) that we wet and placed on my youngest daughters legs while she was riding in the stroller. I had read on the DIS that someone used it for their baby to keep them cool and it REALLY does work!!! It's even better then the neck coolers - we have both. My youngest has a TERRIBLE time in the sun/heat so I knew I better try it. It would be the ideal size for a baby.