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Correlation of 338: Puberty Age Vs. 197: Breast Fed Year
Breast feeding seems to delay puberty. Is it because cow milk contains hormones accelerating puberty onset?

106 Responses:

	Breast Fed Year →
Puberty Age ↓	YES	NO
7	0.0%	0.9%
9	0.9%	3.8%
10	0.9%	5.7%
11	2.8%	9.4%
12	11.3%	21.7%
13	8.5%	14.2%
14	0.9%	4.7%
15	2.8%	2.8%
16	1.9%	0.9%

27 Responses from Males:

Breast Fed Year → x Puberty Age ↓	YES	NO
7	0%	3%
9	0%	0%
10	0%	3%
11	0%	0%
12	18%	22%
13	11%	14%
14	0%	0%
15	3%	3%
16	3%	3%

79 Responses from Females:

Breast Fed Year → x Puberty Age ↓	YES	NO
7	0%	0%
9	1%	5%
10	1%	6%
11	3%	12%
12	8%	21%
13	7%	13%
14	1%	6%
15	2%	2%
16	1%	0%

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Details:
Another possible explanation is that maybe mammals that are not breast fed for long will tend to reach puberty sooner, in the thought that loss of mother would often mean harsh environment and in such conditions it woudl be favorable for organisms to reach sexual maturity as fast as possible.