Testing for food allergies

Kayla • Married & we had our perfect baby boy on 03/21/2015, Pierce Huntlee. He was 7lbs 10oz, & 19.5 in 💙
So the doctor want me to get my son tested for food allergies. Since birth, he's had colic tummy, gassy, acid reflux, and now eczema. He's now almost 7 months and they think he should have grown out of that stuff by now. Wondering if any of you have had to get your infant tested for allergies before and how bad was it. I've had it on myself so I know what it's like but I don't know if they do the same for babies, I know it is still the skin test but I'm not sure if it's the same extent. Thanks in advance!