I think he's saying that a manly man might not be soft and cuddly with a small child like a traditional mother would. But that is not necessarily detrimental. For instance, a guy might not want to coo and caw, or change the pitch of his voice, or giggle, things that some men find weak. But (perhaps - I don't know anything about children) the child may still respond positively to a male who used his normal voice and interacted with them however he naturally felt.