baby now six months old, on ranitidine and gaviscon but not taking to weaning well!

My LO is just past six months and have been weaning now since 21 weeks. Taking it Very very steadily and started just on rice and his usual milk. We were tying a new thing just each week and have now managed to move onto root veg, carrots, sweet pots, butternut sq, broccoli and sometimes can add a bit of cheese. I've been making it all myself but was worried that his nappies were what my husband called explosive!! Poo everywhere and was having to change him completely a few times a day. Thought i'd try organics jarred food but seemed to make him very sick which has never really been a problem as his reflux was silent. Is there any reason why he would be more sick on jars than homemade? I'm fine with making food just seems to trigger is bowels and seems to go straight through him as it were. Not seen any signs of bad reflux tho, which is good. Just the sickness and he'd only put 5oz on in 8 weeks when i took him for his pead appointment. Any comments greatfully recieved. Thanks!!