I have a bottle baby that is 2weeks old today. At his last feeding a few minutes ago, he is going down on his knees and having trouble getting up. Although once I help him, he can stand. So I am thinking vitamin E and Selenium but maybe it is another issue? He is eating well and appears fine otherwise. Of course I can't find my vit.E gel but I have power punch that has both to get him through he night. I also have B complex if you think a shot of that might help? I thought weak leg were mostly at birth. s it normal for him to be having this issue at 2 weeks?