By Amy Sawitta Lefevre and Pracha Hariraksapitak BANGKOK (Reuters) – Thailand is investigating four suspected cases of Zika-related microcephaly in three babies and a 36-week old unborn baby, the public health minister said on Tuesday, in what could be the first cases of Zika-linked microcephaly in Southeast Asia. Several countries in Southeast Asia have reported increasing cases of infection from the mosquito-borne Zika virus but Thailand has one of the highest numbers in the region, with 349 confirmed since January, including 25 pregnant women.