The best replacement for spit up is reflux.

The best alternatives to spit up are rated as following:
★★★★★  reflux
★★★★★  throw up
★★★  vomit
★  vomiting
★  enfamil ar
★  acid reflux
★  vomit infants
★  projectile vomit
★  vomit baby
  vomit toddler
  projectile vomiting
  similac sensitive
  burp
  baby throw up

Your alternative for spit up is not listed? Suggest!
Speaking about spit up, one probably shouldn't forget about enfamil gentlease.

Other search terms related to spit up and their ratings are:
★★★★★ enfamil gentlease
★★★★ alimentum
★★★ green mucus in babies
★★★ white chunks in babies
★ mucus infant
★ similac sensitive
You have in mind a companion for spit up and it is not yet here? Propose!



Google Trends

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spit up
reflux
throw up