I just brought my family here in Qatar. We were 35 kilos over our baggage weight limit at check in. (Our limit was 70 kilos and our checked in baggage weighed 105 kilos!)
I asked the check in counter personnel nicely to allow us the excess baggage since most of them were for our boy.
And to my surprise, before boarding, they even suggested to check in our carry in luggage since they saw me carrying my laptop, two cameras, one stuffed toy, one baby backpack full of toy cars and one carry in luggage while my wife had one baby bag, one bag containing all her jewelries, her shoulder bag and one carry in luggage.
We did not pay a single cent for all the excess baggage. So try to ask nicely.

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