There's such a range of topics on this thread.
First I think CJ was insensitive to refer to 'fertility' especially as her career was in 'comms'.
She gave birth last April 2020, was pregnant presumably 6 to 7 months later, if she miscarried in Jan/ Feb 2021.
And then she conceived again around March 2021. That's hardly an issue with fertility as such and early miscarriages are very common indeed. (Not dismissing the emotional trauma, but many women don't even know they have had one if it's really early. )
Second, I don't think it's relevant to discuss their age gap or BJ's age. Gordon Brown became a father for the first time over 50. Plenty of men have 2nd families in their 50s.
Third- the number of children he has. I don't think it's unreasonable to have a 2nd child with another wife. The real question is why he had 4 in his previous marriage.
The other two 'love children'- well, yes, carelessness by both parties involved.