Gastroschisis patients, after surgery, require regular checkups for growth and development. However, the weak muscles usually recover well in time and you can follow a wait and watch procedure. The nail biting habit, on the other hand, is a behavorial problem and can be corrected with appropriate measures. You may consult the following link for some very useful advise. However, if they do not seem to be working, you should approach your paediatrician.
http://parentcenter.babycenter.com/refcap/preschooler/pbehavior/63801.html
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