They've been credited with increasing the chances of surviving a serious injury by up to 20 percent.
But charities like the East Anglian Air Ambulance and Essex and Herts Air Ambulance receive no government funding, and rely entirely on donations to keep going.
Jonathan Wills and Elodie Harper spoke to Diana Jakubowska from the East Anglian Air Ambulance about how they manage to fund their work and keep flying.
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The baby's father was accused of harming her but doctors have since diagnosed the girl with a rare condition which causes 'easy bruising'.
Alfie from Essex was saved by a team of medics after he had stopped breathing completely.
Two party leaders have been in the region, hoping to win back key seats ahead of the General Election in June.