First, there is no way that Jesus meant anything other than take and eat this bread and then take and drink this wine--at the Last Supper, the chalice was shared  AFTER the meal ended. I don't question the licitness of one-species; still it remains factually a weird, Roman-Rite only aberration from (1) what Jesus said, meant, and did, (2) ancient practice in the West, (3) ancient and modern practice in the East, and (4) modern Protestant practice. It has precious little to recommend it other than canon law.

Second, I have seen a "purificator" used at infant baptisms, but for regular Sunday infant communion, my experience is mostly without cloth. The fuss of arranging a cloth under the chin of an infant in a parent's arms is more likely to cause an infant to fuss and reject the Eucharistic wine than carefully inviting the infant to either suck a gold rod or pinky, or just placing a drop on the child's lips. I'm talking babe in arms here; toddlers is a whole different kettle of fish.