Re: all this perfect boss mum crap. It's a facade; an infernal lie designed to make new mothers feel inadequate, and should be cast back into the fiery chasm from whence it came.
One thing my wife observed when ours were newborn: She kept hearing people saying that parenting would be 50/50 but that simply wasn't physically possible if your husband has a full-time job (as I did). So unless I had quit my job to be a full-time parent and she had stayed on to work instead, there is no way the workload would ever be split exactly 50/50. It was more like 75/25 at best. I suppose it could be done if both parties worked part time or very flexible hours, but that was not the case with my job. Fortunately, my wife knew that was bullshit from the word go, so went into motherhood with her eyes wide open to that. Motherhood is a shock to the system regardless, but at least she had no illusions on that front.