Oh, and Robert being a toddler rather than a baby, well
A) Donna was out of his life by then, so her memories of him would be more likley to be as a baby than a toddler and thus this will have greater impact,
B) The baby being able to say "Mommy" rather than "Ma" or "Mama" suggests it's a bit older
C) It's the Byrne run, better to ignore odd details like that, it's not like he appeared to give a crap about the characters.
D) Hank died as Extant, not Hawk, and yet here he is as Hawk as a Black Lantern, so I'm guessing they have a lot of leeway about the appearance they use.