Perfectly fine to mix a little bit of smooth PB into their porridge if you're introducing it for the 1st time. Can increase it to spreading on toast once you're comfortable but keep in mind that most children don't react the first time, often times it's the 2nd or 3rd time.
Earlier the better :) and thats a great peanut butter to use!
Yes it’s what I use for my daughter. I mix it with porridge, weetabix & put it on toast. She’s 10 months old now x