Hello, My ds is 5 weeks old and pretty much si...

Hello, My ds is 5 weeks old and pretty much since he was born he won't feed properly when we are out. Yesterday he was shocking he just latches on for a few seconds then screams and fidgets and repeats this over and over. Even at our parents houses where I can make myself as comfortable as possible and change positions he's still the same. Just wondering if anyone else has a similar problem and if it improved or how you got around it. Thanks