By a walker I meant an A-frame that she pulls herself up on and struts around. I know 13.5 months isn't old for walking, my son didn't walk until 15 months but he wasn't interested like she was, everyone thought she'd be walking by 11 months the way she just got up and started pushing furniture around but it hasn't happened. As an isolated event I wouldn't worry, but coupled with her stopping growing...

she's only 7.7kgs. She's so little everyone thinks she's 6 months old.