question about eating habits

Mariahhhh • Mommy to a sweet little boy 💙 03/30/16!!!!
Hi guys! I have an 8 month old little boy! He is crawling and standing up on his own. He is incredibly active and fast lol my question is about baby food. He's had baby food for about 3 months now. He eats it fine but he doesn't want more than 1/4 of the 4oz pack. It's so hard to get him to eat! He'll eat for about 5 minutes or so and then he will scream and want to get out of his high chair. He loves the food he just doesn't want anything to do with it after a few minutes. He's too wiggly and messy for me to hold him in my lap and feed him. He drinks a lot of formula and I'm afraid that he's not getting enough from that because everyone keeps telling me he's supposed to be eating mostly baby food. But at the same time I've heard that formula or breast milk is supposed to be the main source of nutrition for the first year. We don't have another drs appt until Jan and I didn't want to call them for a silly question. Thank you for any advice and I'm sorry it's so long :)