Those with 2 children not that far apart

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My son is 16 months old, and will be 20 months old when our second son will be here... I’m so worried and stressed on handling 2 under 2 😭😭 I know I’ll get zero sleep the first 8 months so I know I’m going to be exhausted all the time 😭😭 how do you all do it? Any advice? Because sleeping when the baby sleeps isn’t going to help me now 😩😅