@ harsha,
pls check below links for the understanding of pregnancy related complications
1. latest post by member 4glory with his/her own story
http://www.canadavisa.com/canada-immigration-discussion-board/search-results/-t37196.0.html;msg1368115;topicseen#msg1368115
2. post explained by one member egrace62
http://www.canadavisa.com/canada-immigration-discussion-board/search-results/-t37196.0.html;msg867036;topicseen#msg867036
here is some part of this above post by egrace62:
getting pregnant is a good thing but for we Quebec applicant, pregnancy, wedding, childbirth, can really elongate our processing time to a great deal. if the pregnancy can b delivered before the issuance of ones CSQ, it is still better cos the impact will b very very minimal. The most painful will b pregnancy during the federal stage. it is so bcos, such an applicant will not be able to do the medical( in most cases the pregnant applicant dont inform officials of their pregnancy, but the DMP have as one of their rules not to perform xray exam to pregnant women, they will b asked to come back for the xray after delivery) hence the file will remain stagnant and after delivery, such applicant will now have to go back to BIQ so that the ponts can b recalculated and the new baby added to the CSQ and this can b time consuming. But were it to be for those applying for federal;l Skill;led worker category baby delivery does not hinder or delay only pregnancy does.