What are the characteristics of precocious puberty in 1-year-old girls?

Patient's question:

When I noticed that the baby's private area was red, I thought it was due to the diaper. Recently, I saw the issue of precocious puberty online, and I carefully examined the baby's chest. It seems to be slightly protruding, but not very high, and it looks more like flesh. When I touched it carefully, there was a slightly hard lump inside. The lump was not big and not very noticeable. Additionally, the private area is still red, and my mother thinks it's due to excessive heat. I don't know if this is a symptom of precocious puberty.
Medical history and treatment effectiveness:
Just noticed the issue, no treatment yet.
Help needed:
1. There is a small hard lump in the chest—is this something that develops during puberty or something the baby has had since birth?
2. Is the redness of the private area a symptom of precocious puberty?

Doctor's answer:

Medical Analysis: Regarding your concern, although there are many cases of precocious puberty in infants at present, your child is generally fine.
Advice: For your child's condition, small hard lumps in the chest are usually not a problem. These are normal breast tissues that often develop into breasts during puberty. As long as the lumps are not visibly obvious or can be felt as very distinct hard lumps with the naked eye or by hand, there is nothing to worry about. Additionally, the redness in the genital area is a normal color and not a cause for concern. Based on your current situation, there are essentially no issues—your worries are excessive. You can rest assured. Of course, if you still feel uneasy, you can take your child to the hospital for an estrogen test to check if the levels are above normal, which will confirm whether there is anything to be concerned about.

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