Marriages (and children) were disposable - if somebody changed their mind, they would just up and leave, male or female. Nobody would be able to find them - if they were prepared to leave the children behind, that is. Alcoholism wasn't just the preserve of men, plenty of women got through the drudgery via the medium of Gin. Post WWI, a lot of men in particular would decide that life was too short to remain in their old life and would simply fuck off and start a new life, sometimes only a few miles away from the first. If a wife left or died, if there were no female relatives to pass the children onto, it was imperative that the father should find a replacement as soon as possible and, if the children were young enough to be convinced by 'don't be silly', they would never know that the new 'wife' wasn't their biological mother.
Sometimes, there would be a common story used in particular areas to explain why a woman was a single parent - largely that the husband died in a particularly remarkable circumstance that couldn't be checked. In my town, it's amazing how many women had The First Man Who Was Killed in a Bizarre Motorcycling Accident as their husband - he must have been married to at least 20 different women at once whilst using different names. And died on five successive years, apparently.
You were dirty, cold, hungry and miserable.
Women who had PND or couldn't cope with having children in quick succession either 'went away' or they sent the toddler to Barnado's, particularly if they had fallen pregnant to another man - or the husband decided he didn't want another and she was forced to choose between giving away her baby or her toddler. This still happened post WWII.
Many people claimed to be married, but weren't, because divorce wasn't easily available. There's lots of false surnames of fathers on birth certificates up til the 1950s, as a previously married woman with children wasn't able to change her name when her existing children knew their own names.
It was expected to punish children and animals physically - those who didn't were seen as weird.
Regarding babies with disabilities, I've also heard direct stories of how the midwife/doctor would take the baby to the other side of the room or to another one and 'the kindest thing' would happen. Same with people dying slowly of cancer. If a baby survived/the mother desperately wanted to try, it was most likely taken away whilst she was sleeping a few months later and placed in a home - she would be told to never mention it again.
Right up to the mid 1980s, children were still dying of diseases we can vaccinate against - a school friend nearly died of whooping cough, but her baby brother wasn't so lucky, another friend's brother spent months in hospital with tetanus, an older friend nearly died of Scarlet Fever when I was at High School. Teenage mental health care was almost unheard of (resulting in two suicides in my year).
We didn't get heating or doubleglazing until 1990 - before then, I'd look forward to ice on the inside of the windows because it blocked the gaps and meant the rooms were warm.
Chilblains were a feature of every winter, despite having a pair of gloves, and having a proper coat was something the wealthier kids had, not the poor ones. Proper warm socks were unheard of and umbrellas for kids, along with wellies, were an amazing new luxury - it was expected that you'd get in from school soaked to the skin if it rained. No bath or shower to warm you up - that was once a week on Sunday and a shower was a weird, continental thing that rich people did.
I remember my childhood in the 1970s and 80s as a time of being hungry, cold and sick. The TB I caught is still a potential problem, as I'm going to have to be treated for it before starting other medication. And the whole area was covered in broken glass, rubbish, white dog shit and National Front graffiti.
In short, life was bollocks a generation ago, it was bollocks for the previous one and it was historically bollocks for all the previous generations unless there was Money.