@JellySlice
Absolutely to the sons thing -- I mean, having children was partly an economic decision, balancing mouths to feed against extra bodies to labour, and one of the gambles was girls vs boys, of whom much more economically-productive farm labour could be expected.
There wasn't a heck of a lot of choice whether or not you had children.
The differences in the labour expected from women appeared to be based on context . Eg whether you were a townie with aspirations (Nellie Olson) or trying to prove a claim, in which case women's and girls' labour was assumed. Also whether you worked on or off your farm would make a difference it what was acceptable: women were expected to do manual labour on their/their husband's property, but it was disapproved of for a woman to do manual labour for someone else. OTOH an unmarried woman could do skilled work such as teaching or dressmaking on someone else's land.
Couples often stopped having sex, if they knew they couldn't afford to feed more children, or if there was considered to be a significant risk to the woman's life in having more, or for other reasons. Especially given the total lack of privacy
often Ma and Pa are sharing a one-roomed space or a wagon with their children the relationship between what you did in bed and the production of more of the dependent little people who were lying just across the room, or possibly on the other side of a blanket.
And it didn't even need to mean that the man was a 'considerate' husband, as any homesteader was well aware of the economic value of his wife's work -- it simply wouldn't have been possible for him to raise his children alone while homesteading, if his wife died before there was a daughter old enough to raise the others and cook and run the house. He would need to hire a housekeeper, or break up the family and send his children to relatives. Or of course, marry again quickly to provide his children with a stepmother.
If the Ingallses family planned in this way, they would have probably factored in the fact that they had a blind daughter who was likely to remain economically dependent or at least to need to be cared for by family throughout her life, and also Carrie, who was 'sickly' throughout her life (possibly in response to the privations of the Long Winter), often sought other climates to see if they helped, and who may have seemed as if she was likely to remain living at home -- in fact only she married a much older man at 41.
And Ma isn't even keen on Laura doing heavier farm work on the privacy of the claim, and she's very uneasy about Laura going to sew at the shirtmakers; in De Smet, though I imagine part of her unwillingness was because the town was so rough and lawless, as well as the idea that 'respectable' girls laboured at home, not for cash among strangers.