It's not the emotions, or my post-baby tummy, or loss of income - it's the sheer physical work of it. It's the most physical 'job' i've ever done, including working in old peoples homes!
From 3 months when they start pinching and pulling hair and biting nipples, kicking their little legs at you and scratching, to the effort of lifting and carrying all day long, bending and reaching, dealing with a tantruming 2 yr old kicking and yelling, lifting them up and down from highchairs / climbing frames, crawling under the sofa to get toys - i feel physically beaten up by the end of the day. And way older than 28. Is it just me? Are my kids particularly vicious, or do everyones' little darlings periodically maul them?