I asked several questions in my post... I'd love to ask Wayne Dyer & Dee Garnes those questions.

"It seems that infants and toddlers often arrive here with memories of their lifetimes in the spirit world ..."

and

"They tell of dialogues with God, give evidence that they themselves had a hand in picking their own parents, .."

These assume that reincarnation is a fact... as if anecdotes of children somehow prove that. There are a number of other factors which might just as easily explain why people... children and adults.... have these experiences. We are very far from understanding how the brain/mind works and how it processes & interprets its own internal functions, but it IS very tempting to tell the most 'interesting' story, rather than some mundane thing about interpreting and/or embellishing dreams.