We never did the three day rule, sometimes she had three new foods at one meal with no problems! We never puréed anything so her body digested it as it developed! Banana was also her first ever solid, we handed her half a small banana, she mashed it in her hand and stuffed it in her mouth, no choking. It's quite slimy so just slithered down her throat, if we gave it chopped up or in slices it was too slippery for her to pick up!