Raif VS Husna: Not related to any political parties!

Last 2 weeks, my younger brother's family came to visit us and stayed the whole afternoon. They had lunch and then our kids spent their quality time playing together. Their kids Hana (3) and Raif (5 months old) played happily along side my daughters. Fathini & Hafizah became good hosts by entertaining their cousins with abundance of toys. Raif being the only boy there was not disturbed at all because he could only watched and most of the time being held by his mother.

Husna became clingy and jealous when I wanted to hold Raif. So, I decided to hold both of them and took a photo. Fathini was the photographer and after few trials, we managed to capture the moment when I held both of them. These 2 babies were born last year and about 5 months difference. However Raif is heavier and bigger than Husna as you can see in this photo:

Husna is on my right and Raif is on my left.

At the moment, Raif is almost 8 kg at the age of 5 months while Husna is only 7 kg at the age of 10 months. As I shared about my concern before regarding Husna's weight which is just slightly above the yellow line, I can even see the HUGE difference between her and her cousins who were born on the same year but they are younger (few months different). So, should I worry?