Knit this precious 4 Ply preemie and newborn baby hat to keep little ones warm. This simple little moss stitch heart baby hat is very easy and very quick to knit. the perfect project for a new knitter. The hats in these photos have been knitted in Rowan's beautifully soft Extra Fine Merino Wool 4 Ply. Choose this soft yarn or another soft 4 Ply yarn to knit a cosy little hat to keep little ones warm.