What is the cheapest way to grow kids in the GCC?

Selling again to somebody who has already bought. It is not a strategy anyone finds exciting and it is the only one where the cost per order falls as you use it.

The cheapest growth is the growth you already paid for

Ranked by cost per incremental order: owned channels first, then referral, then paid. Most budgets run that list backwards, and the reason is usually that paid is the only one with a dashboard.

Winning a customer costs money and selling to them again costs almost nothing, and most budgets are spent as though the reverse were true. For a kids and baby store in the GCC, the answer turns on one thing in particular: The customer ages out of every product they buy, so the catalogue has to follow the child or the customer leaves.

What is different about the GCC

The GCC is not one market. Payment habits, delivery norms and language expectations differ enough that a single approach underperforms in at least one country.

Payment preference varies by country more than most planning assumes.

What is different about a kids and baby store

Discounting to grow trains people to wait for the discount. It works once.

Where a mobile app comes into it

Knowing when somebody bought 6-month clothing tells you what they need in six months, and an app is where that is acted on.