It is unusual for such a young baby to have smelly armpits. Of importance is that you mention that your baby is healthy. Sometimes this kind of smell can be due to a yeast infection of the skin under the armpits. If your baby's skin appears to be normal then we need to consider other possibilities. An early hormonal effect may be responsible for your baby's underarm smell. It would be best to ask a paediatrician to see your baby about this as it may be necessary to do some tests to make sure that there is no need for concern.
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