What Could Shaking Of Legs And Stiffness Of Body In Infant Indicate?

Concerns for my daughter My daughter is two months old she was born after two days of being in labour and them breaking my waters n bringing my labour on by a drip then using the suction cup to pull her out after being dilated for two days when she was born I noticed she would shake her leg like a quiver but never thought much of it as I thought it might be her going to the toilet until a week later it mooved from that leg to her arm and mouth on the same side eventually it came to a point where her hole body would shake at time where I felt her spine shake and she would spew or have white frothy bubbles at her mouth I took her to see a peadiatrician who simply said it was a banine thing and she would grow out of it and it slowly stopped for a while but as of a week ago her legs and mouth have started to shake again but its not just that I have noticed she cant moove both legs at the same time she can only get one to moove with the other stopping half way the same thing with her arms she is also very stiff constantly and if her hands are open or closed when she goes stiff it takes her a while to close or open them again I have also noticed that her toes curl up and she cant uncurl them and has alot of trouble sleeping as in having to be held and as soon as you put her down she wakes up I took her to the doctor again and two doctors suggested I take her back to the peadiatrician as he was spose to do an ecg and blood test and she needs one done I want another opionion as to what another doctor may think this all could be thank you