^Good call. I would add Commanders with that too.

Another thing to be mindful of is child safety standards. Transformers toys that are intended for infants are also built with their safety in mind; e.g. less smaller parts that could become a choking hazard etc. Non-preschool TFs aren't designed for this, hence the Ages 5+ or 8+ thing. I would especially avoid giving Masterpieces or any other high end collectible Transformers to infants because TakaraTOMY engineer them explicitly for adults and in Japan they're marketed as "Ages 15+," which exempts them from child safety laws. MP Seekers' fingers come in mind in terms of parts which are easily detachable which could become a choking hazard for babies and toddlers.

I personally didn't let my daughter start playing with G1s and MPs etc. until she was four. Before then it was all the stuff that everyone's been recommending here; Rescue Bots, Legends, plushies etc. I don't know why, but she immediately knew that the PlaySkool TFs were "her" TFs and that all the other TFs were daddy's. I never had to tell or teach her this. One prevailing theory is that she might've been more attracted to the cuter designs and brighter primary colours of the PlaySkool TFs. <shrugs> But if your child is naturally attracted to your G1s and MPs, I'd recommend keeping them on higher shelves until you feel that s/he's old enough to play with them.

But what I used to do would be to play with my TFs and my daughter would play with her TFs alongside me. So for example, I'd be playing w/ my Voyager and Deluxe Class TF Prime TFs while she played with the Happy Meal ones. Or I'd play w/ my MP Optimus Priem while she played with her Rescue Bots Optimus Prime... etc. At first, our toy campaigns were separate, but then they started joining together. Now she'll mix together Leaders, Voyagers, Deluxes, G1s, Rescue Bots, Power Rangers, Lego, Cinderella, Barbie etc.



L-R:
* An example of how my daughter played with TFs at age 2. Optimus Prime vs Optimus Prime. Although back then she couldn't pronounce "Optimus Prime" correctly and kept on calling him "Apple Pie."
* Age 5 play: G1 x Happy Meal x Rescue Bot x Revenge of the Fallen Deluxe. It's an ice cream shop.
* Age 5: Playing w/ an MP