Prevenar is an immunisation against the bacteria called pneumococcus which can cause a severe form of meningitis in young children, usually under 2 years. This same bacteria can cause pneumonia in all age groups but is only one of several kinds of bacteria that can cause pneumonia.
I am not sure if this is your son's present weight or his weight at 13 months. You mention 13 months and then say he is now...etc. If this is his present weight then I am most concerned about it as he is on the 3rd percentile on the growth charts, the lowest 3% of the population. His height is just below the average which is not in keeping with your family's growth pattern either. His paediatrician needs to give him a thorough examination.
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