Dinosaurs: The Complete First And Second Seasons [DVD](1991) DVD
All 24 episodes from the first two seasons--including "The Mighty Megalosaurus," "The Howling," "Endangered Species," "A New Leaf," and "WESAYSO Knows Best"--are featured in a four-disc set. 11 1/4 hrs. total. Standard; Soundtrack: English Dolby Digital stereo; Subtitles: English (SDH); featurettes.

Dinosaurs: The Complete Third And Fourth Seasons [DVD](1992) DVD
All 36 episodes from the third and fourth seasons--including "Nature Calls," "Out of the Frying Pan," "Charlene and Her Amazing Humans," "The Greatest Story Ever Sold," and "Scent of a Reptile"--are featured in a four-disc set. 11 1/4 hrs. total. Standard; Soundtrack: English Dolby Digital stereo; Subtitles: English (SDH); audio commentary; featurette; more.

Who provides the voice of Baby Sinclair?  It's Kevin Clash who also provides the voice for Elmo, the immensely popular Muppet character introduced on "Sesame Street" in the 1980s.

Clash began making puppets when he was 10, having been a "Sesame Street" fan from early childhood. He began performing with his puppets at age 12 in his neighborhood, later taking his act to Baltimore's Harborplace. 

After joining Sesame Street as a puppeteer in 1985, Clash was asked to come up with a voice for a new character. Clash came up with Elmo's distinctive voice and laugh, turning the puppet into one of the show's most popular characters. It also netted Clash an Emmy Award.

Clash also contributed his voice to the "Tickle Me Elmo" doll, a marketing sensation during the 1996 Christmas season. The toys disappeared from store shelves as soon as they appeared, and tales of parents going to great lengths to acquire a doll became a footnote to the season.