Try our smallest pair of circular needles.  Crystal Palace Bamboo 12" Short & Long Circulars have one point shorter than the other for ease when knitting small circumferences.  The shorter point means a longer cord which allows for more flexibility.  Use the short side as your working needle and the long side as your take-up needle.  These cute little circs are fantastic for baby hats and small, tubular knitting.  Available in US sizes 3-8.