To keep baby snuggly and warm at night, you can't beat swaddle blankets and sleep sacks. Most newborns love to be swaddled, it calms them and helps them sleep.
Unless you are an expert swaddler, like the nurses at the hospital, you will appreciate the new swaddle blankets with velcro. It's really easy to wrap them up and keep them happy and secure. The swaddle blankets come in a couple sizes and many colors. You can get jersey cotton for warm weather, Organic Cotton, or Microfleece for cool weather. Make sure you have at least 2 blankets for when you have to wash one. You can usually buy a 3 Pack in the Cotton Knit and save a little money.
My baby loved his swaddle blanket for the first few weeks, but after that he wanted his arms out, so I moved up the the sleep sacks. The sleep sacks are also available with a swaddle type flap, but it won't be wrapped as tight as the swaddle blankets. Every baby is different if what they prefer, so if you purchase several options, make sure you can return the ones you don't need.
Sleep sacks are great for any age baby. Even babies that are crawling or walking as long as they are used to being in the sack. The are great because baby is warm and comfortable and can kick and move around as much as they want and not kick off their blanket. They will sleep better, which means you will sleep better!
The sleep sacks come in Small, Medium, Large, and Extra Large. They are also available in several colors and fabrics. They come in thinner cotton for warm weather, Micro-Fleece for cool weather, and Deluxe Velboa, which is somewhat in between, and a little more breathable than the microfleece.