Thank you for your query,
As the child is active, healthy and the milestones are normal, nothing to worry.
You better stop your breastfeeding
as your child is 2 years.
Give solid diet as it will have more calories and will help to increase the weight.
You can add edible oil or ghee to make it energy dense.
Give one boiled egg daily in addition to his regular diet.
Sagging os scrotum
is normal and if the both testes are palpable in the scrotum, nothing to worry.
Consult your Pediatrician
for interpretation of his height and weight, dietary advise.
Hope I have answered your query.