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noise × 19toddler × 6
infant × 4
sleep × 4
newborn × 3
pre-schooler × 2
behavior × 2
parents × 2
crying × 2
hearing × 2
discipline × 1
development × 1
safety × 1
teaching × 1
tantrums × 1
toys × 1
learning × 1
television × 1
video-games × 1
research × 1
bedroom × 1
night-time × 1
rules × 1
emotional-development × 1
nightwaking × 1