Should you let your babies "cry it out" or rush to their side as soon as they start crying? Researchers have found that leaving an infant to 'cry it out' from birth up to 18 months doesn't adversely affect their behaviour development or attachment.
The study published in the Journal of kid Psychology and Psychiatry found that an infant's development and attachment to their parents isn't suffering from being left to "cry it out" and may actually decrease the quantity of crying and its nduration.
"Only two previous studies nearly 50 or 20 years ago had investigated whether letting babies 'cry it out' affects babies' development. Our study documents contemporary parenting in the UK and the different approaches to crying used" said the study's researcher Ayten Bilgin from the University of Warwick in the UK.
For the study, the researchers followed 178 infants and their mums over 18 months and repeatedly assessed whether parents intervened immediately when a baby cried or let the baby continue howling.
They found that it made little difference to the baby's development by 18 months.
The use of parent's leaving their baby to 'cry it out' was assessed via maternal report at term, 3, 6 and 18 months and cry duration at term, 3 and 18 months.
Duration and frequency of fussing and crying were assessed at equivalent ages with the Crying Pattern Questionnaire.
According to the researchers, how sensitive the mother is in interaction with their baby was video-recorded and rated at 3 and 18 months aged.
The attachment was assessed at 18 months employing a gold standard procedure, the strange situation test, which assesses how securely an infant is attached to the main caregiver during separation and reunion episodes.
Behavioural development was assessed by direct observation live with the mother and thorough assessment by a psychologist and a parent-report questionnaire at 18 months.
Researchers found that whether contemporary parents respond immediately or leave their infant to cry it out a couple of times too often makes no difference on the short - or long-run relationship with the mother or the infant's behaviour.
This study shows that 2/3 of mum's parent intuitively and learn from their infant, meaning they intervene once they were just born immediately, but as they grow old the mother waits for a touch to ascertain whether the baby can calm themselves, so babies learn self-regulation.