This Instructable is for an easy basic baby blanket. It has two layers of flannel and a satin binding. It is very baby-friendly in that it can be machine washed and does not need any other special care. The blanket only takes about an hour or so to make.
Step 1: What you need
-two 1-yard pieces of flannel
-one package satin blanket binding (at least 140 inches long, I use Wrights)
-a sewing machine and knowledge of how to use it
-something to mark your fabric like tailors chalk
Step 2: Wash your fabric
Pre-wash your flannel. This is important because the blanket will be washed a lot and you don't want it to shrink. I usually wash the flannel in warm to hot water and dry it on high heat for maximum pre-shrinkage. Iron your fabric to get any wrinkles out.
Step 3: Measure your fabric
Put the two pieces of flannel together with the wrong sides together and mark the largest square you can on the top piece, which should be about 32-34 inches to a side. Make sure that the pieces fully overlap within the square. You can use the selvedge for one of your edges. I generally measure by laying them out on a large cardboard grid that you can get at most fabric stores. Mark each of the edges of the square with tailors chalk or other fabric marker. The mark doesn't have to come out because it will be covered by the binding in the end.
Once you have your marks, pin the pieces together near the marks so that your fabric doesn't slip when you are sewing.
Some people put little yarn ties through both layers at measured intervals or use another quilting technique so that the fabric doesn't slip against itself when it is a blanket. If you want this, then now is the time. In my experience, these blankets are small enough and flannel sticks to itself well enough that you don't really need it for practical reasons.