Thank you for your query.
You mentioned that investigations done for milk allergy
on your son have been reported as normal. As he is suffering from:
I would like to exclude an infective cause for this problem first. You mentioned that he is teething
which can explain most of the above mentioned complaints and also blood in the stools. Children who are teething tend to put everything in their mouth which can cause diarrhoea and upper respiratory tract
I suggest that you introduce solid food gradually one at a time and see the effect before introducing the next food item. It will be better to let his motions get controlled before you re-introduce solid food.
Kindly also ensure that proper bottle hygiene and food hygiene is maintained. I am sure that you must be very cautious about it.
I hope I have answered your query to your satisfaction.
Wishing your son all the best.