The other things going on in a child's life will be fairly equally distributed through the sample of 10,000 children in the study. They were in any case controlled for in the confounders:
"Briefly, a priori confounders were household socio- economic position (SEP),27 mother?s mental health (Malaise Inventory and Kessler scales)28?30 and mother?s age, education, smoking during pregnancy and relationship status and baby?s admission to a neonatal unit. Additional potential confounders were mother?baby attachment (Condon scale),31 baby?s birth order, mother?s alcohol use during pregnancy,26 type of childcare the child attended and age when the child started childcare."
The study may not be to everyone's personal liking; it may even conflict with what people observe in their own family or neighbourhood. But it isn't 'woolly'! It's a well-organised, well-controlled, cohort study of 10,000 babies which should help guide policy and public spending, and in no way means we can't also research 'latch, hold, etc'.