It is absolutely normal! Children are not suppose to sit still and urs is only 16 months!! Anything and everything is interesting to them so don't force to confine them to a book or 2 in the library. Have u been reading to him on a somewhat regular basis? U might wana consider building the habit at home and then using the library to expand that experience. They are curious about everything and have v short attention span - mainly for u to just show and tell him a thing or 2. U can refer to this for reading expectations https://www.google.com.sg/amp/amp.parents.com/baby/development/intellectual/age-by-age-guide-to-reading-to-your-baby/
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