The boat that takes you to Elephant beach from Havelock you will have to take the same to return back

No

As others have given you the details, I would say, better avoid with such a small baby, however if you wish to visit then opt for a bigger boat so it's safer and less amount of tossing from the waves while traveling.

Snorkeling u can do in the jolly boy island, and scuba u can do it in govinda nagar beach or some other destination also there. We did it there .

The time is almost fixed. The boats take you there by 10am and mostly will return by 2pm. 4 hours is good enough to roam around the small strip of island, beach games + snorkeling, Ocean walk, water scooters, etc. There are rest rooms, lockers for dress, eateries, at a nominal cost.

Hi ... this depends on the monsoon. It will start to rain around September through November and hence most of the sea activities will be closed including this one. My guess is you might be taking chances visiting Andaman during September. My suggestion is to plan after December so that you get to visit different islands. Pl also check with some local tour operator or hotel about visiting Andaman in September .

Yes why not ! As such there is nothing to be seen which requires guides help

Except Scuba all other water activity's ideal place is elephanta beach at havelock , for scuba north bay island is better place.

Yes! Not just elephant beach but most of the smaller island activities gets closed during peak summers. And its peak summers there at the moment. Even the private ferries stops services. Best time to visit andaman is December to feb.

I paid Rs 800/- per head...... my family enjoyed it a lot....