J.E.
Hello, my twins were in the NICU too. They were born 1 lbs 15 oz and 3 lbs 7oz. They had such a big weight difference because of a rare syndrome that occurs in in identical twins called Twin to Twin Transfusion while still in utero. Anyway, they were in an isolette (incubator) until they were able to regulate their own body temperature which was around 4-5 pounds. While in the isolette the babies only had a diaper on and they kept the temperature at 98 degrees. After they were moved to an open crib, they would bundle up the babies all the time. The nurses told me the babies stay slightly colder than us. It's not good to bundle them up in hot weather. But if it's cool then they should have a blanket on. Ask your daughter if she has a swaddler. It's made by SwaddleMe or Kiddopotamus. Maybe you can buy one for her. I was never good at swaddling with a blanket. These have velcro to keep the swaddle in place. It also helps the babies to sleep better at night when they are bundled up because it resembles being in the womb. Maybe she is only e-mailing pictures with a t-shirt because she thinks her baby is cute in that outfit. She might not be sending you pictures with the baby bundled up. Good Luck and Congratulations!