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If your baby is arching their back, in most cases, it's normal. But, there are some medical conditions that cause this and need treatment.

See a chart of average baby weights by month for the first year, and learn why weight matters and when (and why) you should see the doctor.

Discover reviews, ratings, and trailers for Baby ... Secret of the Lost Legend on Rotten Tomatoes. Stay updated with critic and audience scores today!