Moses basket too small, baby boy too wriggly!

It doesn't matter how I put my little one to sleep wether he's swaddled, in a sleeping bag or just in a light blanket - he still ends up like this. I'm so scared he's going to get stuck there against the side of the basket. He's got lots of growing room length wise but it's just too narrow. He's only 3 weeks but incredibly strong and wriggly and able to move around the basket. Anyone else got the same thing? He's too small to move out into his Cot in  is own room but too fidgety for the basket!!