Birth Month	n	Crawling Age	SD	Temp
January	32	29.84	7.08	22
February	36	30.52	6.96	22
March	23	29.7	8.33	17
April	26	31.84	6.21	11
May	27	28.58	8.07	14
June	29	31.44	8.1	0
July	21	33.64	6.91	-1
August	45	32.82	7.61	0
September	38	33.83	6.93	3
October	44	33.35	7.29	9
November	49	33.38	7.42	14
December	44	32.32	5.71	19