Babies left to cry stay unhappy hours afterwards as stress hormone remains high
By
Fiona Macrae
|
Don't be fooled: Babies continue to be unhappy
for hours after crying as the levels of stress hormone cortisol remain
high, but just keep quiet about it, a study has found (file picture)
It is a blissful moment for any parent, when a once fractious baby finally learns to fall asleep without a murmur.
But mothers and fathers should not be lulled into a false sense of security, because their child may actually still be upset.
A
study found that levels of the stress hormone cortisol remain high in
‘cry babies’ even in the days after they have apparently learnt to
settle themselves.
In other words, the child is still unhappy but just keeping quiet about it.
The
research will reignite the debate about the pros and cons of
controlled crying – letting unsettled babies sob themselves to sleep.
Sticklers
for routine, such as childcare guru Gina Ford, say that if babies cry
during designated sleeping hours they should not be picked up.
But
others, including fellow author and childcare expert Sheila Kitzinger,
claim mothers should be guided by their instincts and not by
prescriptive routines.
The study involved tracking hormone levels in babies and their mothers.
Many of the children, who were
aged between four months and ten months, had trouble getting into a
routine or settling without being comforted.
During the study they were put to bed and left to soothe themselves to sleep, and the length of time that they cried was logged.
More research needed: The brevity of the study
means it is not clear if cortisol produced by the babies does eventually
drop, so a larger one is now underway
Their
mothers stayed in a room near enough to hear any cries but were not
allowed to go to their children. Levels of cortisol were measured in the
women and in their babies on the first night of the study and on the
third.
By the third night,
the infants cried little before dropping off. However, their levels of
cortisol remained high, the journal Early Human Development reports.
In
contrast, the amount of cortisol in the mothers had dropped, suggesting
that they had relaxed due to the lack of crying from their baby.
Wendy
Middlemiss, a researcher at University of North Texas, said: ‘Although
the infants exhibited no behavioural cue that they were experiencing
distress at the transition to sleep, they continued to experience high
levels of physiological distress, as reflected in their cortisol scores.
‘Overall, outward displays of internal stress were extinguished by sleep training.
‘However,
given the continued presence of distress, infants were not learning how
to internally manage their experiences of stress and discomfort.’
The
brevity of the study means it is not clear if cortisol produced by the
babies does eventually drop. The researchers are now doing a longer
study, to see if the hormone’s level falls with time, as babies learn to
cope with going to sleep alone.
Siobhan
Freegard, of the parenting advice website Netmums, said: ‘I don’t think
anybody would ever say that you shouldn’t use controlled crying – it is
about getting the balance right.
‘If
you are on maternity leave with your first child and can have a nice
lie-in and breastfeed the baby in bed, that is very different to being a
single mum who needs to go out to work or no one will eat.
‘I
have been advised many times to try controlled crying, but it caused me
much more stress than picking up the baby and doing what comes
naturally.
‘But I know other mums who have found controlled crying short, sharp and successful.’