Infancy begins at birth and ends at what age?

The answer is As per an article posted in Britannica site, earliest stages is the time of life among birth and procurement of dialect which is around one to two years after the fact.  

Explanation:

Outset is the most punctual piece of a man's life, when they're a child. Early stages is ambiguously characterized, as a rule including the time from birth to around one year old. You can likewise utilize the word to signify "the specific start of something," so if your lemonade stand is fresh out of the box new, it's still in its early stages. A great deal occurs amid your child's initial three months. Most children achieve certain points of reference at comparative ages, yet baby advancement isn't a correct science. Anticipate that your child will develop and create at his or her very own pace.

answer; /// i believe the correct answer is (achilles tendon)(c)