Hi. All fruits except pineapple and papaya are okay to consume.  However it is suggested that you consume watermelon after soaking it for 2 hours In water.  Jackfruit has seen to cause loose motions in a few mom's so prefer to avoid it. 

watermelon fine, but fruit produces heat to body...

its fine, only papaya and pineapple are no-nos...

watermelon is definitely ok. but I m not sure abt jack fruit