Here's the tab for Twinkle Twinkle LIttle Star - Ukulele. The tuning of the ukulele is:-
G (one octave higher) - 4th string (i.e one whole tone below A on 1st string)
C - 3rd string
E - 2nd string
A - 1st string

Note: Below the lyrics are the chords - Key of C (chord 1), F (chord IV) and G (chord V).

A_|____________________0____0_______|
E_|_________________________________|
C_|__0____0_________________________|
G_|___________0____0____________0___|

___twin___kle_twin__kle__lit___tle__star
____C____C___C____C___F___F___C__C

A_|_________________________________|
E_|__1____1___0____0________________|
C_|____________________2____2___0___|
G_|_________________________________|

____how___I___won_der_what__u___are
____F_____F___C___C___G____G____C__C

A_|_________________________________|
E_|__3____3___1____1___0____0_______|
C_|_____________________________2___|
G_|_________________________________|

____up___a___bove_the_star__so___bright
____C____C___F____F___C___C____G_____G

A_|_________________________________|
E_|__3____3___1____1___0____0_______|
C_|_____________________________2___|
G_|_________________________________|

____like__a___dia_mond_in__the___night
____C___C___F___F____C___C_____G____G

A_|____________________0____0_______|
E_|_________________________________|
C_|__0____0_________________________|
G_|___________0____0____________0___|

___twin___kle_twin__kle__lit___tle__star
____C____C___C____C___F___F___C__C

A_|_________________________________|
E_|__1____1___0____0________________|
C_|____________________2____2___0___|
G_|_________________________________|

____how___I___won_der_what__u___are
____F_____F___C___C___G____G____C

END