Yeah, sometimes I've had litters of babies and some of them did that occasionally and lived just fine so it's not always a fatal condition but it's certainly not a good sign and needs to be taken seriously. Overheating, or warming small ones up to quickly can trigger seizures as well. Check those temps with several different thermometers, stay away from using bright lights and never expose albinos to UV radiation. Better to use a ceramic heat emitter or undertank heater. (heat without light)