I'm not familiar with your output unit - does it have a ir reciever? If so just get another cheap flash gun and filter it with the deep red & deep green filters from a Rosco filter swatch - that should be an adequate ir "transmitter" (I don't know why the green, but that's what I found when I dismantled an old Bowens ir trigger, I guess they should know what theyre doing).

As for flashing a baby's eyes - don't use direct lighting, diffuse & reflect to soften the effect and lessen intensity.