Mildly Infuriating

There's a whole trove of portrayals of happy, loving single-child families out there! You just have to look to China's one-child policy era.

"But Fireweed! This is literally propaganda!" It's all propaganda, whether it's "be content with one child" or "be fruitful and multiply." Media depictions of large families appear fun and loving because the creators make it that way (the more kids the more you have to work with: there's the jock kid, the geek kid, the uptight kid, the...). Even media about the difficulties of large families (e.g. Cheaper by the Dozen) still end with everyone being happy and loving because it makes for a feel-good ending; that doesn't mean it reflects reality in the slightest. Society doesn't like to talk about the darker sides of large families because of heteronormativity, but there's some media out there portraying large families as hopelessly dysfunctional (Shameless for instance, or you can read about any of the large family "reality TV" shows that have ended in scandal).

Remember that we're in unprecedented times; large families used to not only be the norm but were practically required (have lots of kids to work the farm, or because you don't know how many are going to survive to adulthood, or because there's no social safety net for when you become old/sick/injured except your family members). Nowadays it's the opposite: more kids equals less resources to go around, and unchecked population growth combined with unchecked consumption is wrecking the planet. But media hasn't caught up yet, and with influential, wealthy people out there screaming racist nonsense about "crashing birth rates" and "great replacement theory," there's pressure to continue to portray large families positively and small families poorly. It's the same situation as the propaganda I linked above, but in reverse.

In other words, rejoice that you've eschewed the media narrative and done the right thing for your family! Also forget visual media (where creators use large families to portray the appearance of a happy family, because more kids = more hugs and smiling faces in the shot = more love, right?) and look to books, where there are plenty of depictions of loving, functional, single-child households.