How our new born (1 month) baby can travel by plane.what are immigration requirements??

Just his passport.

Just to avoid any more misleading posting, the law in the UK has changed so that babies and children up to 16 who are not ALREADY on a parent's or guardian's passport must have their own child passport if they are going to travel abroad. If you don't believe, ring up the passport information advice service 0871 989 3108.

All your child needs is either a passport or being registered in your passport.
Please keep in mind that journeys by plane can be very uncomfortable for babys and small children due to pressure variations during take-off and landing.

Depends on where you're going. Your child needs whatever visas his or her citizenship requires. Normally, you all should only need a passport, but just getting that can be tricky.

Babies this young are actually *great* little travellers. More on that later but I have to warn you, getting the passport in time might be more the problem than actually flying.

If your new addition is not yet born, get the paperwork ahead of time. Organize the photo because not everywhere does it. The first time I ventured outside with mine was to get their passports. Since I live outside my country, it was a bit more difficult. I had the forms filled out and all the instructions while I was still pregnant.

You may need to pay extra for rush delivery.

I'm a former Flight Attendant and I fly a lot transatlantically with my own three children now. I had many, many little passengers this age and almost all of them did well. It's actually a good time to travel with a baby. I think the biggest problem will be everyone coming to admire her. Mine were each 4 months old when they flew the first time and I wish it were so easy now!

First of all, I really recommend bringing a car seat and using it onboard. Make sure your car seat is approved for use on aircraft. If you're flying on a U.S. company, see the below link for information on if it's approved. Most car seats, including infant buckets, sold in the U.S. are.

If you are flying a non-U.S. company, check your airline's site for rules regarding car seats.

Checking them risks damage and loss. On my last flight, three of our four bags didn't make it (they did arrive two days later) but I had the car seat with me so my daughter was safe on the 2 hour drive home. I saw some car seats with the lost luggage while I was looking for my bags. Having it onboard is peace of mind and a guarentee it gets to your destination.

Most car seats sold in the U.S. are FAA approved. To be sure, please visit this page;

http://www.faa.gov/passengers/fly_childr...

If it's an infant carrier, get out the owner's manual and get comfortable with the belt-only installation before the trip. Most do not need the base onboard but check your model to be sure.

Bring the car seat to the door of the aircraft and if you're not able to use it onboard, it will be "gate-checked", which is more gentle than checking it in at the desk in front.

It's not necessary to check the stroller in at the counter. You can take it to the gate and they will tag it. Remember this doesn't count against your baggage allowance. Make sure the tag goes somewhere that wont be squished or hidden when the stroller is folded. Bring a bungee cord to double-secure your stroller after you leave it at the door of the aircraft. This will prevent it from getting damaged if it pops open en route.

If you do manage to be able to use the seat on board, make sure your baby is in it for take-off and landing. These are the (hate using this wording but...) the most dangerous parts of the flight. It's very important that she or he is strapped in.

Many flying tips will say to make the baby suck during take-off and landing to help their ears. This is inaccurate. The baby can drink during ascent (after take-off) or even when he or she wakes up inflight. ENT specialists recommend that the baby be awake about an hour before landing (not necessarily drinking). Landing or "touch down" is too late.
http://www.entcda.com/AAOHNSF/earsandalt...

If you seat is part of a travel system, bring that or get a stroller frame. Both work fine and both can be left at the door of the aircraft.

Still try to get a bulkhead seat. Bassinets are great but rare, especially on U.S. companies.

Just some extra tips;
-Bring about 1/3 more supplies than you think you'll need, formula, diapers, wipes, etc.
-Bring a change of clothes for both of you (at least a T and shorts for you)
-wrap everything bulky, like clothes and extra diapers in plastic bags, and use rubber bands to reduce the bulk and save space in your carry-on
-If you formula feed, use the kind of bottles with plastic liners. Premeasure the powder, roll them up and put them in a ziplock bag. Airplane bathrooms have bad sinks for washing traditional bottles.
-Make sure you baby is used to a room-temperature bottle. I warmed many a bottle in my career but I saw first-hand what a pain it is. The baby isn't getting any health-advantage to the warmed bottle and no one will do this task while you're in the security or check-in line.

About 8 years ago, I wrote an article on flying with children for an expat newsletter. Over the years many parents have contributed, both on line and in Real Life. I later put it on a blog so that parents had access to non-commercial information from someone with both practical and professional experience on the web.

Feel free to visit; http://flyingwithchildren.blogspot.com

Good luck getting that passport fast!