Some important things to look out for in children are:

• Not reacting normally to sounds
• Trouble locating the source of sound or voices
• Speech delays
• Trouble developing correct speech sounds 

There can be several factors that may cause hearing loss in children, some major ones are listed below:

• Genetic factors causing congenital hearing loss include autosomal recessive hearing loss, Autosomal dominant hearing loss & Genetic syndromes.
• Non-genetic factors include birth complications, infection, lack of oxygen, Premature birth, nervous system or brain disorder.