I am feeling abit unsure of myself as a parent now 
dd2 has just had a filling and She wasn't toilet trained properly until she was 3.4, not for the want of trying either. We tried everything but she freaked out at the sight of a potty so I left it in the end for a few months and tried again when she was 3.1.
Her nursery teacher was very judgy of me (and still is, she is also reception teacher)
DD1 and ds have perfect teeth. and both were trained at 2.5 years even ds who is adhd/possiblyasd
But they have all been read to, have tons of books and toys, toothbrushes, have clean clothes, we are not smelly, they are warm and fed.
We interact as a family, ds and I star watch outside regularly and dd's and I read together a lot and mess about, go for walks etc
We are chaotic sometimes but thats life.
We also live on a council estate 
I do know children though who are like the children in the op, 2 members of my families children (not mine, can't say much more)
They are not neglected but they are not priority if you know what I mean,