A handicap of this sort was more likely to exist before the pregnancy and birth than be caused by it.
If you could demonstrate a correlation or causation between the same woman (or man) before the birth of their child and afterwards, then you'd likely have something to go on.
As is, tho, it seems more likely that these people have always just been poor with people's names. Or that their age (typically 40+ by the time children are grown enough to be truly responsive by name) has taken it's toll on their mental faculties, moreso than the actual birth of a child.
It's analogous to noticing that most politicians are deceitful. It's more effective to assume that they were deceitful before assuming office than believing the office itself inspired the deceit.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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