Out of stock dilemma question

Hey guys,

I keep hearing the same advice from all the Amazon FBA gurus — “the worst thing that can happen to you is to run out of stock.”

But at the same time, they all suggest starting small, like ordering 500–1000 units for your first batch.

Here’s my dilemma:
If your calculations are right and you sell out in, let’s say, 1–2 months, but your next production + sea shipping takes around 90 days, then you’re basically guaranteed to go out of stock.

So what’s the actual playbook for mature or experienced sellers?

• Do you order the second batch right away after launch (even before knowing how the product performs)?
• Do you switch to air freight for restocking?
• Or do you accept being out of stock for a bit and just focus on re-ranking later?

I’m trying to understand what’s realistic for small brands that don’t want to overextend on cash flow but also don’t want to kill their momentum.

Would love to hear how you guys handle this.