i used to make these for all my kids. However i made them out of flannel with a drawstring bottom so they could still use them in the summer and when they got taller. Buttrick used to have a pattern in their infant patterns that included the closed bottom nightgowns. The heavier sleepers like this can get awkward. The air force child development centers use ones made from a heavy flannel or light fleece instead of blankets for the babies. That way the child can't get caught up in blankets and suffocate. The ones for the littler baby's actually wrap around like they are being swaddled and fasten with Velcro. Some babies sleep much better in them than with blankets once they get used to them.