Since giving birth 3 months ago my brain has just gradually turned to mush. I used to think of myself as intelligent and pretty quick witted. Today somebody asked me my age and I genuinely didn’t know, I had to phone my mum. I got my daughters birthday wrong on her passport application. I can’t think of the words for anything. I can barely form a sentence, it took me 15 minutes to type this. I feel like my IQ has genuinely plummeted. Is this reversible or should I prepare for a lifetime of stupidity?