Thank you for your query.
It is not uncommon for children of this age to have repeated bouts of upper respiratory tract
infection. This shall continue till the age of about 5-6 years. However developing wheezing
is not a good indication. The daughter may need further investigations to know why she is developing pneumonia.
The weight of both children appear normal. Kindly ensure that they have a well balanced nutritious diet which shall help them build their immunity better.
I hope I have answered your query to your satisfaction.
Wishing your children an early recovery.