Is my niece growing at a normal rate?

My niece Adriana was born on January 19th, 2018 at 5 lbs 4 ounces. At approximately 4 months old, she weighs somewhere between 12 and 13 lbs and is 26 inches in length. Other than being tongue tied, she seems fine but I am a bit worried about her being on track. She seems good, she babbles, tries to crawl, is... show more My niece Adriana was born on January 19th, 2018 at 5 lbs 4 ounces. At approximately 4 months old, she weighs somewhere between 12 and 13 lbs and is 26 inches in length. Other than being tongue tied, she seems fine but I am a bit worried about her being on track. She seems good, she babbles, tries to crawl, is lifting her head up, can sit up on her own for several seconds, and eats over 12 ounches of her milk a day, but she seems so small for her age. Is her size a concern?
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Update 2: she **** on my face now so **** you?
Update 3: binky binky boo boo tinky tingly poo poo
Update 4: pooooooppppopplllplppplppdndjdoskndneosk...
Update 5: **** you!
Update 6: UH OH, WHO WANTS TO DIE
Update 7: DOUBLE PENEE WANKER WHOO HOO HOE
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