It is always worrying for parents when the permanent teeth start to erupt and appear to be crooked. Yes you are correct to be worried about milk teeth which are not shaky at this stage. This can be due to the permanent teeth not erupting immediately below the milk teeth and in very rare conditions where the permanent teeth are not present at all.
You should seek an experienced dentist or orthodontist to examine your child. Typically an xray will be taken to check for the presence and location of the adult teeth.
3 out of 4 children have crooked teeth and hence it might be of great benefit if you look up myofunctional development and MyoBrace on in the internet. We find that Myobrace can help correct crooked teeth spontaneously (ages 6-15yrs) and in many instances we can avoid conventional braces treatment at a later age.
All will be well
Dr Samintharaj Kumar
General Dental Surgeon