我是陪读老公的，刚转为学生准证，（老公也是持学生准证）我想由我和老公担保我妈妈来的费用，这种情况能得到签证吗？
It is possible. It is noly way you can do as well.
But you have to provide the finacial support evidence such as TA/RA letters
在申请时需要注意些什么呢？邀请信是写我妈来看我还是来看外孙呢？
It isnot a good idea. They may question if your mom would be able to go back to China because you need her to take care your baby. She can and noly can apply a visitor visa, which means short term visiting. Good luck
