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Pregnancy is 16 days in syrians. The female will usually get rounded and pear shaped but this doesn't usually show till around 11-12 days or not at all with small litters. Some females get a bit bitey during pregnancy or they try and escape or nest build. You don't need to really do anything except clean the cage around 12 days and give loads of bedding. Remove any tubes or small enclosed hideouts as these are too small if she decides to have pups in there. The wheel needs removed just before the birth. Don't mess with anything near the nest until the pups yes open and provide lots of good foods. We can advise on that if pups do arrive.