Megan also had all of the actual medical supplies we use with Abby: suction, ambu bag, catheters, gloves, syringes, trachs, etc. Caleb was allowed to touch and try out everything. He even "suctioned" the water out of the cup! (That ended up backfiring on us a bit because he announced later that suctioning Abby was now his job!)
In his three year old way, Caleb lost interest pretty quickly. He made it clear that he didn't want to talk about the trach or his feelings about it at all, which was pretty telling. Megan was able to pull things in every now and then though, and I know Caleb absorbed way more than he let on. I look forward to discovering just how much he actually got out of it over the next few days.
It was wonderful to see the two of them together in a more natural environment. For once, Abby was at Caleb's level and he could do more than just lean over her crib.