age	birth_weight	sex
40	2968 	 m 
38	2795 	 m 
40	3163 	 m 
35	2925 	 m 
36	2625 	 m 
37	2847 	 m 
41	3292 	 m 
40	3473 	 m 
37	2628 	 m 
38	3176 	 m 
40	3421 	 m 
38	2975 	 m 
40	3317	f
36	2729	f
40	2935	 f
38	2754	f
42	3210	f
39	2817	f
40	3126	f
37	2539	f
36	2412	f
38	2991	f
39	2875	f
40	3231	f