2nd baby and mom's guilt

Feeling guilty as we haven't really started feeding solids to my 8 months old baby. He ate one or twice then stopped and feed occasionally. When he is fed puree, he kinda don't know how to swallow or just spit out.. the reason the delay was that he was having cough then later diarrhea and now recovered. But lately he vomits one or 2 times a day. We don't know what is happening, going to the doctors. If compared to no.1, I'm afraid he is delayed in his milestones.. but also know that boys might develop later? Idk, feels v guilty