I am seeking to buy large posters for my 1 year old baby. The posters
have to be large: more than a meter (3.3 feet) in length and height.
Themes: toys, cartoon heroes or something else sutiable for a baby
play room.

Hello irenabalin,

=== 
Poster CheckOut has the largest selection of large prints I could find.
http://www.postercheckout.com/PictureGroup.asp?OrderBy=P.MaxSize+desc&submit=Go&Price1=&Price2=&ColorID1=&ColorID2=&Height1=&Height2=&Width1=&Width2=&PrintCount=1785&CategoryID=119&ArtistID=&Title=&Artist=&SearchString=&DoOR=&ReturnCount=12

===
Fine Art has a wonderful selection, that meets (mostly) your size requirements
http://www.thefineartcompany.co.uk/Animals/animal18.HTM

http://www.thefineartcompany.co.uk/Animals/animal5.HTM

http://www.thefineartcompany.co.uk/child/kids1.htm


=== 
Movie Posters

http://www.moviepostersdirect.com/prodtype.asp?PT_ID=104&numRecordPosition=19&ph=cat&strKeywords=&&strSearchCriteria=

http://www.moviepostersdirect.com/product.asp?numPageStartPosition=55&P_ID=2348&strPageHistory=&strKeywords=&strSearchCriteria=&PT_ID=104

http://www.moviepostersdirect.com/product.asp?numPageStartPosition=55&P_ID=3703&strPageHistory=&strKeywords=&strSearchCriteria=&PT_ID=104

=== 
Poster Dreams
http://www.posterdreams.com/int/produkt.asp?id=PR23063&preLoad=1

=== 
Movie Poster Shop
http://www.moviepostershop.com/display.php/5_1____1-20593.html

http://www.moviepostershop.com/display.php/5_1____1-25381.html

http://www.moviepostershop.com/display.php/5_1____1-16121.html

http://www.moviepostershop.com/display.php/5_1____1-25369.html

=== 
Art.com

This page lists numerous posters, ordered by size:
http://www.art.com/asp/display-asp/_/ID--1846/PG--1/posters.htm?sortSelect=sizeHlarge

 Almost the size you requested, Elmo is always a favorite!
http://www.art.com/asp/sp-asp/_/PD--10095342/Elmo.htm?sOrig=SCH&ui=F913B2F0BE374FA69745DE64AF22261A

Smaller than requested, Beatrix Potter is always lovely in a baby's room.
http://www.art.com/asp/sp.asp?PD=10085501&RFID=379093&engine=froogle

http://www.art.com/asp/sp-asp/_/Aff--CONF/CTID--118299883/RFID--204623/TKID--15040254/pd--10071325/posters.htm

Art.com seems to ship internationally as well.
http://www.art.com/asp/customerservice/international_shipping-asp/_/posters.htm?ui=F913B2F0BE374FA69745DE64AF22261A

=== 
Low Cost prints
http://www.lowcostprints.com/art/p3053.html

2 very large dog and cat posters here:
http://www.lowcostprints.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=KIDS&Store_Code=L

http://www.art-find.artselect.com/perl/frView?artID=41317&t=cg15-c1983&collectionID=1983

=== 
Posh Tots
http://www.poshtots.com/catalog/239/4405/product_detail.asp

The rest on this site are too small, but fun to look through!
http://www.poshtots.com/catalog/239/1347/product_list.asp?1=1&show=12&start=25

=== 
Some larger posters:

http://artwork.barewalls.com/product/framer.exe?ArtworkID=105615&thumbs=1&productid=103457

http://artwork.barewalls.com/product/framer.exe?ArtworkID=70108&thumbs=1&productid=44885

http://artwork.barewalls.com/product/framer.exe?ArtworkID=69634&thumbs=1&productid=45360

=== 
Acclaim Images
Most are not quite your size, but lovely!

http://www.acclaimimages.com/_gallery/_print_pages/0058-0502-2511-0334.html

http://www.acclaimimages.com/_gallery/_print_pages/0001-0503-1017-0350.html

http://www.acclaimimages.com/_gallery/_print_pages/0015-0501-2121-5536.html

http://www.acclaimimages.com/_gallery/_print_pages/0061-0502-1213-5128.html

=== 
All Posters

Babar
http://www.allposters.com/gallery.asp?aid=85559190&c=c&search=8276&GCID=s15100x001-Others&KEYWORD=%22Large%20posters%22

Nemo
http://www.allposters.com/gallery.asp?aid=85559190&c=c&search=8276&GCID=s15100x001-Others&KEYWORD=%22Large%20posters%22

Pooh
http://www.allposters.com/gallery.asp?aid=85559190&c=c&search=8276&GCID=s15100x001-Others&KEYWORD=%22Large%20posters%22

Monsters, INC
http://www.allposters.com/gallery.asp?aid=85559190&c=c&search=8276&GCID=s15100x001-Others&KEYWORD=%22Large%20posters%22

=== 
Cafe Press

http://www.cafepress.com/shop/baby-gifts/browse/N-3810+1220_pv-babyandme.22252496_Ne-1160_bt-2

=== 
This site has numeous posters that "almost" meet your requirements
http://www.123posters.com/disney.htm

=== 
A bit more pricey children's art:
http://www.bestart.com/grid/subject/47/?WT.mc_id=KW1108&WT.srch=1


If you live near a JoAnn, Pier One, One World Market, or a framing
store, check them for very large posters. I had no idea they would be
so hard to find online. Perhaps you could frame and mat them to make
them lager on the wall. Another idea is to purchase canvas stretchers
at a frame or craft store and staple a colorful children's print to
them. They look great on a wall, and are simple to make.

Here's how to do it
http://painting.about.com/library/weekly/aa012102a.htm

http://www.bhg.com/bhg/story.jhtml?storyid=/templatedata/bhg/story/data/popartwallhanging_06252002.xml&catref=cat3430006


Hope you find some ideas from this answer!

Sincerely, Crabcakes

pets and child art prints: www.mindtwin.com

Also, if you have prints you'd like to turn into large posters,
calypso is the printer for almost everything of size on the wet coast.
 http://www.calypsoinc.com/

They have instructions for how to save your file for best printing. I
tried them out, and was very pleased.

Calgonia-ga,

   I had considered posting some printing services, but assumed they
could/would not enlarge copyrighted work. Are you saying one can send 
a print to Calypsoinc and they can enlarge ANY print?

   Since the prints on mindtwin don;t meet the customer's size
requirements, can CalypsoInc legally reprint them in a larger size?

   Thanks, Crabcakes

Hi Irenabalin,

Crabcakes certainly has provided ample information in her answer to your question.

Maybe I have misunderstood what you have in mind, but I personally
would think twice about decorating an infant's room with posters
showing things significantly larger than life-sized; firstly, because
I question how infants' visual perception deals with unrealistically
large images; secondly, because it may give the child a false
impression of the actual toy or whatever prior to its actually
experiencing the same.

NO, I have no professional background to support my feelings.  
This is just a well-meant comment.

Regards, Myoarin