I see your birth club is December, which is actually a good month because you can buy during 11/11 or Black Friday. Just take note of the longer shipping date since it’s gonna be a massive sale worldwide. You can buy a bit of things here and there first then stock up more during this sale period.
I gave birth in June but I started buying around March to April because I’m afraid I no longer have the energy to walk and shop around when nearer to due date 😅 bigger and heavier bump makes me have difficulty walking, plus shortage of breath.