Just wondering if anyone has experienced their LO getting an upset stomach or seeming to be in pain after their first time having food. When did you feed LO for the first time? What food?

My LO is 4 1/2 months old, and our original plan was to not feed him until 6 months or pretty close to it, and to skip rice cereal and go straight for veggies and fruits and nutritious things. Well, I was testing out our new Babycook and he seemed super interested - DH tried a bit and LO was reaching for it, and he does drink a ton, is a good solid weight, and sits up well when being supported. So we spur of the moment decided to give him just a spoonful to see what he thought. He loved it! We ended up giving him a bit more, but for the rest of the day he was fairly fussy, rejecting bottles, and seemed like he was in pain.

I guess it's possible he's just teething and the food thing was a coincidence, but I'm having guilt over the possibility that we gave him an upset stomach. The food was pears, which I had read were full of fiber and supposed to be very easy to digest, but now I'm hearing from some that it can act as sort of laxative too and upset baby's tummy? I guess I could always just try a different food, but for now I've scared myself off it a bit. He has a checkup on Monday so I'm planning on talking to the pedi about it then.