This si shen brown rice powder is said to improve baby's appetite. If so does that means that overweight baby are not advisable to take it?

Hi, one of my friends mix this with soup and also with breast milk. She only adds a small amount and is not too concerned about it affecting her baby's weight. She wanted to try because a lot of her friends recommended it as one of the first food options to introduce to her baby as it is very nutritious.