Layover in Beijing

I will be laying over in Beijing for 7 hours on my way to Singapore, will I need any type of visa for this? I will be travelling from Singapore through Southeast Asia and will end up in China again for a total of about 10 days. Obviously, I need a visa for this, but will I need a multi-entry because I am entering the country twice, though I will not be leaving the airport during my layover? Thanks!