1. He wants to take a lot of pictures of baby.

2. He wants to take a lot of pictures of the baby.

3. He wants to take a lot of pictures of babies.

4. He wants to take a lot of pictures of a baby.

(Are they all grammatical? What about #1? Is Sentence 1 correct? Please focus on the articles in the sentences.)

#1 should be He wants to take a lot of pictures of a baby.

technically you shouldnt use the word a lot cuz its poor grammar

I disagree with Alexis. Using "a lot" is good grammar.

Your sentences are fine -- except for # 1.

its really not good grammar ms. sue because you could use synonyms for the word a lot....you could used many or an extensive amount,,,but you really shouldn't use the word a lot...it just doesn't sound good

All of the sentences you provided are grammatically correct. However, they have slight differences in meaning due to the use of articles.

1. "He wants to take a lot of pictures of baby."
This sentence is grammatically incorrect. It is missing the article "a" or "the" before "baby". The correct sentence would be: "He wants to take a lot of pictures of a baby."

2. "He wants to take a lot of pictures of the baby."
This sentence is grammatically correct. It uses the definite article "the" before "baby", suggesting that there is a specific baby in mind.

3. "He wants to take a lot of pictures of babies."
This sentence is grammatically correct. It uses the plural form of the noun "baby" and does not require an article before it. It implies that he wants to take pictures of multiple babies.

4. "He wants to take a lot of pictures of a baby."
This sentence is grammatically correct. It uses the indefinite article "a" before "baby", suggesting that he wants to take pictures of any baby, without specifying a particular one.