The paediatrician found that two-day-old babies who dozed(打瞌睡) on their mother's chest slept better than those who (1) ____ ( place) in cots(幼儿床). Sleeping alone makes (2) ____ harder for mother and child to bond and damages the development of the brain, (3) ____ ( lead) to bad behaviour as the child grows up,researchers fear. Dr Nils Bergman,at the University of Cape Town,South Africa,says that for ideal development,healthy newborns (4) ____ sleep on their mother's chest for the first few weeks.After that,they should stay in the mother's bed (5) ____ they are three or even four years old. Sixteen infants were studied while they slept on their mother's chest and in a cot by her bed.It (6) ____ (reveal) by monitoring that the baby's heart was under three times as (7) ____ (much) stress when he or she slept alone. Being in a cot also affected sleep,with the babies' brains less likely (8) ____ (make) the transition between two types of sleep called active and quiet. In the cots,only six out of the sixteen had any quiet sleep and its quality was far (9) ____ ( bad). Making this transition is thought to be the key (10) ____ the normal development of the brain.

Babies should sleep in their mother's bed until they are at least three years old.The controversial advice comes from a paediatrician(儿科专家).
    The paediatrician found that two-day-old babies who dozed(打瞌睡) on their mother's chest slept better than those who (1) ____ ( place) in cots(幼儿床).
    Sleeping alone makes (2) ____ harder for mother and child to bond and damages the development of the brain, (3) ____  ( lead) to bad behaviour as the child grows up,researchers fear.
    Dr Nils Bergman,at the University of Cape Town,South Africa,says that for ideal development,healthy newborns (4) ____ sleep on their mother's chest for the first few weeks.After that,they should stay in the mother's bed (5) ____ they are three or even four years old.
    Sixteen infants were studied while they slept on their mother's chest and in a cot by her bed.It (6) ____  (reveal) by monitoring that the baby's heart was under three times as (7) ____  (much) stress when he or she slept alone.
    Being in a cot also affected sleep,with the babies' brains less likely (8) ____  (make) the transition between two types of sleep called active and quiet.
    In the cots,only six out of the sixteen had any quiet sleep and its quality was far (9) ____  ( bad).
    Making this transition is thought to be the key (10) ____ the normal development of the brain.

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