You can do this, but it would be better to give your child the supplements one at a time and observe how their digestive system reacts to the product.
If you give your child 4 different robotic drugs and, for example, diarrhea, loose stools, vomiting or abdominal pain appear, it will be difficult to determine which supplement is the cause. Therefore, in my opinion, a better solution would be, for example, to combine BioGaia with one of the above-mentioned supplements (all the others containing bifidobacteria) for e.g. a month and observation, then you can change the probiotic with bifidobacteria to another one. Unless the doctor recommended otherwise.

Here you can compare the prices of this type of product in online pharmacies and place your order with home delivery or pharmacy pickup:

https://www.gdziepolek.pl/produkty/11562/biogaia-protectis-baby-krople/apteki

https://www.gdziepolek.pl/produkty/104687/symbiosys-bifibaby-krople/apteki

In cities such as Warsaw, Wrocław, Katowice, Kraków, Lublin, Gdańsk, Łódź, Szczecin, Białystok, Poznań and Chorzów, products can be ordered with instant delivery in as little as 1 hour thanks to the Wolt Drive service.

- check if the service is available in your location: https://www.gdziepolek.pl/koszyk/szybka-dostawa?src=zf

I've attached links to helpful entries:

https://www.gdziepolek.pl/substancje/bifidobacterium-bifidum

https://www.gdziepolek.pl/kategorie/probiotyki-dla-dzieci