The size of the blanket is very important, because you don't want to buy a small one that will not cover your baby entirely. Babies have the tendency to move a lot in their sleep and if the blanket does not have the right size, it will also uncover them, exposing them to all sort of risks, like catching a cold.
The fabric of the blanket is a very important issue that you need to focus on. You will find a lot of blankets that are made from improper materials for the baby's skin. You won't have any trouble in that matter if cotton is your first option. When it comes to the weight of the blanket, remember not to buy heavy ones. 500 grams is the optimum weight. The baby won't get suffocated by it and will also assure him the comfort that he needs.
You will also want to find a blanket that is washable and affordable. Since there will be accidents and the blankets will need to be washed you don?¡¥t want to spend a lot of money on a blanket that you either can?¡¥t wash that often or that falls apart after washing.