Non-Painful Burning sensation

I've been getting this odd burning or warmin. sensation that travels from my stomach (or maybe the baby) up to my ribs. It's not painful at all, but certainly hard to ignore. And it's not the entire stomach but like a stream completely unrelated to heart burn because that is a feeling I know well. I explained it to my husband and he said the baby was peeing. He knows nothing. Ha. Does anyone else have this?