Baby cereal questions

My LO is 5 months he’s had oatmeal cereal for the past two weeks, about a tablespoon once a day but he Doesn’t eat it all which is fine. He has a bottle of breastmilk about 30 min to an hour before cereal is offered. I know his poops will change consistency since starting solids but he’s been having thick mucous like poops and today there was a few bright red spots in his poop. I notice that he’s been straining and grunting a lot when he poops.

My diet is already soy dairy and egg free so I know that’s not getting to him.

The red spots in the poop might be from him straining to poop🤷‍♀️

I don’t know what’s going on- he doesn’t act in pain or discomfort. The only thing close is the straining and even then he’s not acting in pain.

Can I stop giving him the oatmeal cereal and see what happens in a week or two and then introduce it again when he’s closer to 6 months? Will that cause any harm to stop giving it to him since he’s been having it for two weeks?

Can I stop giving it to him and just give him purées instead?

Thanks for your help!