According to some news articles I found, leaving a baby to cry can cause brain damage:
"Leaving baby to cry could damage brain development, parenting guru claims"
Leaving a distressed baby to cry on a regular basis could be damaging to the developing brain, according to parenting guru Penelope Leach
"Babies left to cry can suffer brain damage, warns parenting guru"
Distressed babies who are repeatedly left to cry are at risk of developing problems in later life
These articles also state that this is in conflict with other research (from the independent link):
However, research published last month found no ill effects on children whose parents had used "controlled crying" when they were babies.
I'm really curious to know how this research was conducted. I can't imagine they told some mothers to not tend to their babies' needs. I'm curious to know what qualifies as regular, repeated crying, and for how long.
I haven't been able to find out which research they're talking about here. Will leaving a baby to cry cause brain damage? How much crying is too much?