Are you trying to keep them warm? A heat lamp in a brooder is the best way to do that. Check out the Articles section of this site for articles on brooding chicks or ducks. Chicken and duck brooding is very similar.
They need to let there bodies develop. There legs need to learn to support them. Goslings grow so fast every day is important for there bodies to develop strong straight and healthy. Not a criticism really. But confining there growth will give you allot of issues in the future.