Why is the warmer used?
When your baby is born in a hospital, it seems nearly immediatly the cord is cut and the baby is whisked off to a bassinet sitting under a warmer. The reason for this is quite simple: your baby is born wet and they are unable to heat themselves when they’re born. So, a warmer makes sense to keep the baby warm while it’s getting examined, cleaned up, footprinted and swaddled.
A baby will benefit more from skin-to-skin contact with mom though, instead of sitting under a warmer for any length of time. Moms body, combined with a blanket, will keep the baby wonderfully warm and also comforted because your baby will recognize your smell, enjoy the feeling of your skin, and be soothed by the sound of your voice and heartbeat.
When we had my son born at home I held him close, skin to skin, until his cord stopped pulsing. We cleaned him up the best we could with a towel and made sure all was well as soon as he was born of course, however the exam didn’t come until later. Once the cord was cut, I got up to shower and was settled into bed. My midwives then did the newborn exam, I got the honor of putting his first diaper on (cloth, of course!) and my daughter chose that moment to wake up - as soon as my son was cleaned, examined, swaddled and back in mommy’s arms ready to nurse for the second time (first time we nursed right after birth as I was waiting for the cord to stop pulsing). My daughters timing was perfect! 
My son was born at 5:53AM - and I loved being up in labor all night while my daughter was asleep…. But this time, I hope to labor during the day so my daughter can watch the birth. She is so excited!