Is it not more likely that, generally speaking, women are taught how to talk to babies and children and that men, who are taught that it isn’t their job, actually don’t have the skills but can learn them.
Completely anecdotal to me and DH but that's what I was thinking. DH is a quiet person in that "blokeish" way - if you talk to him, he's happy to have a conversation but if you don't, he's happy to sit in companionable silence. And he kinda transposed that to babies. Once he realised that his (conversational) input would benefit their language development and that it is a parental obligation to be an instigator not a passive responder, he went for it. But if I hadn't pointed it out, I think he would have been a long time coming to the realisation by himself.