The Fox Children’s Network has captured its first November ratings sweeps victory on Saturday morning since its September 1990 debut.FCN animated shows finished first among households with children ages 2-11 and children and teens ages 6-17, providing the animation service with a clean sweep of the sweeps this year (the weblet also won Saturdays in February, May and July). The 6.9 rating/25 share in the key 2-11 age group marked a 27% rise in ratings and a 28% boost in share over last November. ABC (4.8/18), CBS (4.7/17) and NBC (0.9/4) saw declines in the kids’ audience during November. But the Peacock web, which caters to teens on Saturdays, had the second highest four-week household average with a 3.2/11 vs. FCN’s 3.5/13. Fox showed strength across the board, but its victory was led by the pairing of “X-Men” and “Mighty Morphin Power Rangers.” The two shows dominated the 11 a.m.-noon hour, with FCN’s 34 share average greater than the three competing webs’ combined share performance. Elsewhere in Nielsen’s daytime and fringe ratings report for the Thanksgiving week ending Nov. 28, “The Late Show With David Letterman” scored its highest average since its premiere week with a 5.7/18. NBC’s “Tonight Show With Jay Leno” averaged a 4.7/14 — it’s best performance since the week of June 21 — and ABC’s “Nightline” grabbed a 4.5/13. Letterman also garnered his highest individual night rating since week No. 2, when Vice President Al Gore paid a visit, virtually assuring CBS a latenight sweeps win for November. CBS is projected to wind up with a 5.5/18, vs. a 4.4/13 for NBC’s “Tonight Show” and a 5.1/15 for “Nightline.” Letterman has just about doubled CBS’ performance in the daypart from November 1992, with the web up 96% from the 2.8 earned a year ago by its action series checkerboard. CBS also continued its daytime win streak, claiming its 247th consecutive title. Its “The Young and the Restless” (8.4/30) was the week’s top-rated program. In the morning race, ABC’s “Good Morning America” (4.5/19) extended its household winning streak to 13 weeks. NBC’s “Today” show trailed with 4.2/18, followed by “CBS This Morning” with a 3.1/13.