Can a 6w baby choke on spit up or reflux? she coughs after swallowing and sometimes seems to gasp for air. she clears her throat even while sleeping.

Yes: This can be a serious condition, and yes, a baby can choke from reflux material. Raise head of crib/bassinette slightly and keep upright after feeds. Also, I would suggest you ask her pediatrician about a swallow study, where they actually watch with special formula as she feeds and swallows to see if any is going into her lungs and the whole swallowing mechanism is working right.