Usually this kind of behaviour such as head banging and rocking in infants is a form of attention seeking. However it seems that your baby daughter is indeed copying the behaviour of the autistic baby next to her. Your baby must be very clever. You do not want this kind of habit to become entrenched so it would be best if she was moved to a positon away from the autistic baby.
If she has a temper tantrum you should not smack her as this aggravates the problem.Your daughter is still a bit young and disciplining her is going to be difficult at her age, but just put her in her room with the door closed every single time that she starts with a tantrum. She must not be allowed out until she is quiet.
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