babies flown from nepal to tel aviv , israel , with their parents on monday .
several premature infants evacuated on small military plane in morning .
later in the day , five more youngsters touched down at sde dov airport .
up to 33 babies could be flown from nepal in total following earthquake .
many gay israeli couples travel abroad to have children with surrogates .
in israeli , the procedure is limited , by law , to only heterosexual partners .
earthquake and triggered avalanches have killed more than 4,600 so far .