If you have a ToysRUs near you they should have a wide selection of newborn costumes. You can also look at any department store or costume shop in your area.
The best Idea for a newborn costumes are called Bunting costumes they look like baby sleeping bags. They come in different styles I think the cutest is a pumpkin.
A costume for a newborn infant seems illogical, but here are some sites which may help you: http://www.cradletokindergarten.com/baby-toddler-costumes.html , http://www.costumecraze.com/Baby-Costumes.html , and http://www.mrcostumes.com/Newborn-Costumes-C385.aspx . Between those, one should get you what you want.
Newborns need size 0-3 months. You can find information about newborn costumes at the following website: www.cradletokindergarten.com/baby-toddler-costumes.html
You can find newborn costumes at the same places you buy costumes for the rest of the family. Spirit Halloween, Halloween Express, Wal-Mart, Target, Sam's Club, and Sears will all carry newborn costumes though the selection is typically limited.
A baby's first Halloween is a memorable experience. Finding newborn Halloween costumes, however, can be a challenge. There are many Halloween costumes in small sizes available in stores, so many consumers turn to the Internet to find a nice selection of newborn Halloween costumes for their baby. On Halloween, pictures are taken and memories are set in stone forever. You want your baby to look adorable for their first Halloween in a costume made for their small size. But, since your child won't be wearing the costume for very long, you don't want to spend a lot of money. You'll find the best prices, and biggest costume selection, online at specialty Halloween stores. The best newborn Halloween costumes are those that are made with comfortable material, which will cradle your baby safely. A smart money-saving option is to purchase newborn Halloween costumes that double as pajamas. This way, not only will your child look adorable on Halloween night, but the costume can be reused as a sleep outfit until the child grows out of it. These costumes come in a variety of styles and colors, and are priced for any budget. Shop for newborn Halloween costumes from any number of themes. Imagine how adorable your infant would look dressed as a small green pea pod, fluffy teddy bear, or colorful candy corn. There are newborn Halloween costumes for all your favorite Superheroes too! Superman, Wonder Woman, Spiderman, Batman, and others, are available in sizes for newborns and beyond. This would be a cute idea for those with more than one child. Dress the older child as one Superhero, and the infant as another. Or, dress one as the good guy and one as the villain. Safety is of utmost importance when shopping for newborn Halloween costumes. Remember to look for costumes made of flame-resistant materials, and avoid anything that covers baby's face. Avoid zippers and buttons, or costumes with intricate beading, to keep your baby safe.
There are many retailers that offer costume buntings for newborn babies. You can tiny vampire costumes and peas in a pod and even little caterpillar costumes for a newborn to wear for their first Halloween.
I really recommend any cute costumes such as zoo animals, characters from Disney, or even fairy tale characters. A good source of inspiration can be found online by looking at baby costume retailers online such as: http://www.spirithalloween.com/baby-costumes/.
You can go to your local store to purchase a halloween costumes. Some drug stores may include Target, Children's Place, etc. Some drugstore should also sell newborn halloween costumes.
You can get cheaper newborn Halloween costumes at local discount stores where people donate their used costumes and the store sells them for cheaper then retail price.
they can be a smallest newborn only if you have a problem with the baby or if you have a miscarriage
A newborn baby has approximately 7 × 10^27 atoms.
A newborn baby is usually about 24 inches long, or two feet