In this paper, we study the post-entry patterns of survival and growth of firms established in Portuguese manufacturing in 1983. Our data suggest the existence of a highly turbulent economy, with a very large number of small firms being created, but a great proportion of new firms disappearing in the first years subsequent to their birth. Survivors, however, grow quite fast and we found that small firms grow faster than their larger counterparts. Moreover, we found that the growth decision of firms is affected by a firm specific component, which is also correlated with firm size. These two effects are oppositely signed and, therefore, estimates that fail to take this firm specific effect into account are likely to be strongly biased towards zero.