<P> The paternity leave list may be used when a player chooses to leave the team to attend the birth of his child . A player placed on the paternity leave list must miss the next team game, but no more than three games . The team can use another player from its 40 - man roster to replace a player on the paternity leave list . This list was adopted beginning with the 2011 season . </P> <P> If a player not on a 40 - man roster has spent four years with a minor - league contract, originally signed when 19 or older or five years when signed before the age of 19, he is eligible to be chosen by any team in the rule 5 draft during the offseason . No team is required to choose a player in the draft, but some do . If chosen, the player must be kept on the selecting team's 25 - man major league roster for the entire season after the draft--he may not be optioned or designated to the minors . The selecting team may, at any time, waive the rule 5 draftee, such as when they no longer wish to keep him on their major league roster . If a rule 5 draftee clears waivers, he must be offered back to the original team, effectively canceling the rule 5 draft choice . Once a rule 5 draftee spends an entire season on his new team's 25 - man roster, his status reverts to normal and he may be optioned or designated for assignment . To prevent the abuse of the rule 5 draft, the rule also states that the draftee must be active for at least 90 days . This keeps teams from drafting players, then "hiding" them on the disabled list for the majority of the season . For example, if a rule 5 draftee was only active for 67 days in his first season with his new club, he must be active for an additional 23 days in his second season to satisfy the rule 5 requirements . </P> <P> Any player chosen in the rule 5 draft may be traded to any team while under the rule 5 restrictions, but the restrictions transfer to the new team . If the new team does not want to keep the player on their 25 - man roster for the season, he must be offered back to the team he was on when he was chosen in the draft . </P> <P> The intent of the rule 5 draft is to prevent teams from holding major league - potential players in the minor leagues when other teams would be willing to have them play in the majors . However, this draft has also become an opportunity for a team to take a top prospect from another team who might not be ready for the major leagues . For example, Cy Young award winner Johan Santana was chosen by the Florida Marlins four years before winning the award, when the Houston Astros declined to put him on their 40 - man roster . The Marlins chose Santana in the 1999 rule 5 draft, and traded him to the Minnesota Twins who kept him on their roster for the 2000 season, in which he toiled to a 6.49 earned run average at only 21 years of age . Two years later, he legitimized himself as a Major League pitcher, with an ERA under 3.00, and two years after that, he was recognized as one of the best pitchers in the league . Had he not been chosen in the rule 5 draft, he likely would not have made his major - league debut until the 2001 or the 2002 season with the Astros . </P>

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