1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision.
2. Babies can see their parents’ faces but will not respond with a smile until they are a few weeks old.
3. Babies may gaze intently into a small, unbreakable mirror attached to the inside of their cribs.
4. While following an object with her eyes is when eye coordination develops.
5. Because of a newborn’s limited ability to see color forces him to focus only on bright colors.
6. The reasons babies occasionally cross their eyes is because they are perfecting their tracking skills.
7. Whether a light sleeper or a heavy sleeper, a typical baby does not need complete silence in order to rest well.
8. The fact that newborns can vary dramatically in their sensitivity to sounds and ability to sleep in noisy environments.
9. The reason that a two-month-old baby turns her head toward her parents’ voice is because she is beginning to recognize familiar sounds.
10. Through changing his facial expression indicates he may find a particular sound soothing or comforting.
2 answers
Where are your answers?
I'll make comments about each one, and you can decide what you need to do.
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1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision.
There is no subject here.
2. Babies can see their parents’ faces but will not respond with a smile until they are a few weeks old.
There are both present and future tenses here. Are you supposed to make the verbs all one or the other?
3. Babies may gaze intently into a small, unbreakable mirror attached to the inside of their cribs.
??
4. While following an object with her eyes is when eye coordination develops.
Again, there is no subject here.
5. Because of a newborn’s limited ability to see color forces him to focus only on bright colors.
No subject.
6. The reasons babies occasionally cross their eyes is because they are perfecting their tracking skills.
To have "reasons" implies that more than one reason will be stated in the sentence. Also the word "because" needs to be replaced with the word "that."
7. Whether a light sleeper or a heavy sleeper, a typical baby does not need complete silence in order to rest well.
??
8. The fact that newborns can vary dramatically in their sensitivity to sounds and ability to sleep in noisy environments.
This is an incomplete sentence: no verb for the subject.
9. The reason that a two-month-old baby turns her head toward her parents’ voice is because she is beginning to recognize familiar sounds.
See #6 about "reason" and "because."
10. Through changing his facial expression indicates he may find a particular sound soothing or comforting.
This is a subordinate clause, not a complete sentence.