I have links/references I can post if anyone wants to read what researchers and infant/toddler experts are saying.

Alot of what is being said currently about "containerisation" comes from the research coming out of the Pikler Institute in Budapest (Hungary). Although there are some aspects of the way they look after the orphans in their care I would challenge... the full attention they give to these very young children, and the way in which they respect the child's physical development and knowledge about how the body grows and how to "handle" (that is, hold, lift a shoulder, pick up, etc) babies is just stunning.

And so obvious and sensible... and yet look what we do to our babies.