Luca likes to listen to voices. It seems to calm him and keep him happy while he plays. I practiced noting out loud for a bit while he rummaged around. It is a very effective way of continuing the flow of attention. Nothing is an obstacle. Baby, sounds, movement....there are no interruptions. The perception of the impermanence of each occurrence is re-enforced and aids in taking on board all occurrences as equally lacking weight to pull the mind into "interruption territory".
Belief that some aspect of experience can interrupt the flow of attention is the cause of the interruption itself as I see it. When this belief goes poof!, there are no more interruptions, just the field of experience with baby at play within it, of it, it, .
Sensation-impermanent, sound-impermanent, sight-impermanent, intention-impermanent, I practice and voice my presence at the same time. Father and son are happy.