Oh, I totally understand the scramble with short notice, that's quite stressful when you've got your first one to sort out! From what I hear, SGH tends to slot elective sections either early morning (around 7, 8am) or mid-morning, though they do keep it under wraps until the day before. Since you're looking at childcare, it might be worth asking your obstetrician if they can give you even a rough window, some mums have managed to get at least that much hint beforehand so they could plan better.
For your son, you could look into booking a backup option now (trusted relative, mum-helper, or reliable childcare centre that takes last-minute bookings) rather than waiting for confirmation, just to have peace of mind. That way when SGH calls, you're not scrambling. Your husband will be with you during the op, but you're right that having a solid plan B for your son takes one big worry off.
Wishing you a smooth procedure, and do check with your own specialist about the admission timing too, since they might have some flexibility or at least a better sense of what to expect for your particular case.
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