Here are Cartoon Network, Cartoonito, and HBO Max's premieres for April. The info here may be incomplete and is subject to change. If I missed anything or made any mistakes, please let me know and I'll add/fix it as soon as I can.
Cartoonito
Bing
Monday, April 4 - 8:10 A.M. (EST) - 123A - Nature Explorer
Monday, April 11 - 8:10 A.M. (EST) - 123B - Choosing
Monday, April 18 - 8:10 A.M. (EST) - 123C - Dark
Monday, April 25 - 8:10 A.M. (EST) - 124A - Stuck
CoComelon
Friday, April 1 - 7 A.M. (EST) - 239-241 - Lost Hamster/Jello Color Song/Yes, Yes, Dress for the Rain
Friday, April 8 - 7 A.M. (EST) - 242-244 - Thank You Song (School Version)/Playdate With Cody/Winter Show and Tell
Friday, April 15 - 7 A.M. (EST) - 245-251 - Counting Apples/Pretend Play/Valentine's Day Song/This Little Piggy/Tie Your Shoes Song/Halloween Costume Song/Halloween Day at School
Love Monster
Monday, April 4 - 7:50 A.M. (EST) - 219 - In a Spin Day
Monday, April 4 - 8 A.M. (EST) - 220 - Invent Something New Day
Monday, April 11 - 7:50 A.M. (EST) - 221 - Moon Cake Day
Monday, April 11 - 8 A.M. (EST) - 222 - Movie Night
Monday, April 18 - 7:50 A.M. (EST) - 223 - Pool Party Day
Monday, April 18 - 8 A.M. (EST) - 224 - Spectacular Sparkly Night
Monday, April 25 - 7:50 A.M. (EST) - 225 - Starring Role Day
Monday, April 25 - 8 A.M. (EST) - 226 - Super Fun Day
Lucas the Spider
Friday, April 29 - 8:30 A.M. (EST) - 138-140 - Prickly Pals/A Sting in the Tale/Tongue Twister
Mecha Builders
Saturday, April 30 - 7:30 P.M. (EST) - 101 - They Sent Us a Pie/Dust in the Wind [SERIES PREMIERE]
Pocoyo
Friday, April 1 - 7:30 A.M. (EST) - 331 - Big and Small
Monday, April 4 - 7:30 A.M. (EST) - 332 - Face Painting
Wednesday, April 6 - 7:30 A.M. (EST) - 333 - Pocoyo's Supermarket
Friday, April 8 - 7:30 A.M. (EST) - 334 - Elly's Playhouse
Monday, April 11 - 7:30 A.M. (EST) - 335 - Pocoyo's Puppet Theater
Wednesday, April 13 - 7:30 A.M. (EST) - 336 - Up and Down
Friday, April 15 - 7:30 A.M. (EST) - 337 - Pocoyo's Breakfast
Monday, April 18 - 7:30 A.M. (EST) - 338 - Traffic Jam
Wednesday, April 20 - 7:30 A.M. (EST) - 339 - Pato's Living Room
Friday, April 22 - 7:30 A.M. (EST) - 340 - Cinema
Thomas & Friends: All Engines Go!
Monday, April 4 - 9 A.M. (EST) - 215 - Something to Remember
Monday, April 11 - 9 A.M. (EST) - 216 - Sandy Versus the Storm
Monday, April 18 - 9 A.M. (EST) - 217 - An UnbeLEAFable Day
Monday, April 25 - 9 A.M. (EST) - 218 - A Rusty Rescue
Cartoon Network
Craig of the Creek
Monday, April 11 - 5 P.M. (EST) - 411 - Chrono Moss
Tuesday, April 12 - 5 P.M. (EST) - 412 - In Search of Lore
Wednesday, April 13 - 5 P.M. (EST) - 413 - Opposite Day
Thursday, April 14 - 5 P.M. (EST) - 414 - Adventures in Baby Casino
Friday, April 15 - 5 P.M. (EST) - 415 - Creek Talent Extravaganaza
Monday, April 18 - 5 P.M. (EST) - 416 - Dodgy Decisions
Tuesday, April 19 - 5 P.M. (EST) - 417 - Hyde & Zeke
Wednesday, April 20 - 5 P.M. (EST) - 418 - The Anniversary Box
Thursday, April 21 - 5 P.M. (EST) - 419 - Lost & Found
Friday, April 22 - 5 P.M. (EST) - 420 - Grandma Smugglers
DoDo
Thursday, April 28 - Season 1 [HBO Max]
Lamput
Friday, April 29 - Seasons 1-3 [HBO Max]
Looney Tunes Cartoons
Friday, April 1 - 11 A.M. (EST) - 122 - Puma Problems/Marvin Flag Gag: Bowling Ball/Duplicate Daffy
Friday, April 1 - 11:15 A.M. (EST) - 123 - Key-Tastrophe/Hole Gag: Hammer the Rabbit Hole/A Devil of a Drink
Friday, April 1 - 7 P.M. (EST) - 210 - Mt. Neverest/Telephone Pole Gag: Zip Line/Fast & Steady
Friday, April 1 - 7:15 P.M. (EST) - 125 - Bounty Bunny/Hole Gag: Underwear/Vender Bender
Sunday, April 3 - 5:30 P.M. (EST) - 124 - Weaselin' In/Time Out!
Sunday, April 3 - 5:45 P.M. (EST) - 126 - Mallard Practice/Beaky Buzzard: Mouse/Born to Be Wile E.
Movies/Specials
Friday, April 1 - 5 P.M. (EST) - Shrek Forever After
Sunday, April 3 - 6 P.M. (EST) - Napoleon Dynamite
Sunday, April 10 - 6 P.M. (EST) - Harry Potter 20th Anniversary: Return to Hogwarts
Saturday, April 30 - 7 P.M. (EST) - See Us Coming Together: A Sesame Street Special
Cartoonito
Bing
Monday, April 4 - 8:10 A.M. (EST) - 123A - Nature Explorer
Monday, April 11 - 8:10 A.M. (EST) - 123B - Choosing
Monday, April 18 - 8:10 A.M. (EST) - 123C - Dark
Monday, April 25 - 8:10 A.M. (EST) - 124A - Stuck
CoComelon
Friday, April 1 - 7 A.M. (EST) - 239-241 - Lost Hamster/Jello Color Song/Yes, Yes, Dress for the Rain
Friday, April 8 - 7 A.M. (EST) - 242-244 - Thank You Song (School Version)/Playdate With Cody/Winter Show and Tell
Friday, April 15 - 7 A.M. (EST) - 245-251 - Counting Apples/Pretend Play/Valentine's Day Song/This Little Piggy/Tie Your Shoes Song/Halloween Costume Song/Halloween Day at School
Love Monster
Monday, April 4 - 7:50 A.M. (EST) - 219 - In a Spin Day
Monday, April 4 - 8 A.M. (EST) - 220 - Invent Something New Day
Monday, April 11 - 7:50 A.M. (EST) - 221 - Moon Cake Day
Monday, April 11 - 8 A.M. (EST) - 222 - Movie Night
Monday, April 18 - 7:50 A.M. (EST) - 223 - Pool Party Day
Monday, April 18 - 8 A.M. (EST) - 224 - Spectacular Sparkly Night
Monday, April 25 - 7:50 A.M. (EST) - 225 - Starring Role Day
Monday, April 25 - 8 A.M. (EST) - 226 - Super Fun Day
Lucas the Spider
Friday, April 29 - 8:30 A.M. (EST) - 138-140 - Prickly Pals/A Sting in the Tale/Tongue Twister
Mecha Builders
Saturday, April 30 - 7:30 P.M. (EST) - 101 - They Sent Us a Pie/Dust in the Wind [SERIES PREMIERE]
Pocoyo
Friday, April 1 - 7:30 A.M. (EST) - 331 - Big and Small
Monday, April 4 - 7:30 A.M. (EST) - 332 - Face Painting
Wednesday, April 6 - 7:30 A.M. (EST) - 333 - Pocoyo's Supermarket
Friday, April 8 - 7:30 A.M. (EST) - 334 - Elly's Playhouse
Monday, April 11 - 7:30 A.M. (EST) - 335 - Pocoyo's Puppet Theater
Wednesday, April 13 - 7:30 A.M. (EST) - 336 - Up and Down
Friday, April 15 - 7:30 A.M. (EST) - 337 - Pocoyo's Breakfast
Monday, April 18 - 7:30 A.M. (EST) - 338 - Traffic Jam
Wednesday, April 20 - 7:30 A.M. (EST) - 339 - Pato's Living Room
Friday, April 22 - 7:30 A.M. (EST) - 340 - Cinema
Thomas & Friends: All Engines Go!
Monday, April 4 - 9 A.M. (EST) - 215 - Something to Remember
Monday, April 11 - 9 A.M. (EST) - 216 - Sandy Versus the Storm
Monday, April 18 - 9 A.M. (EST) - 217 - An UnbeLEAFable Day
Monday, April 25 - 9 A.M. (EST) - 218 - A Rusty Rescue
Cartoon Network
Craig of the Creek
Monday, April 11 - 5 P.M. (EST) - 411 - Chrono Moss
Tuesday, April 12 - 5 P.M. (EST) - 412 - In Search of Lore
Wednesday, April 13 - 5 P.M. (EST) - 413 - Opposite Day
Thursday, April 14 - 5 P.M. (EST) - 414 - Adventures in Baby Casino
Friday, April 15 - 5 P.M. (EST) - 415 - Creek Talent Extravaganaza
Monday, April 18 - 5 P.M. (EST) - 416 - Dodgy Decisions
Tuesday, April 19 - 5 P.M. (EST) - 417 - Hyde & Zeke
Wednesday, April 20 - 5 P.M. (EST) - 418 - The Anniversary Box
Thursday, April 21 - 5 P.M. (EST) - 419 - Lost & Found
Friday, April 22 - 5 P.M. (EST) - 420 - Grandma Smugglers
DoDo
Thursday, April 28 - Season 1 [HBO Max]
Lamput
Friday, April 29 - Seasons 1-3 [HBO Max]
Looney Tunes Cartoons
Friday, April 1 - 11 A.M. (EST) - 122 - Puma Problems/Marvin Flag Gag: Bowling Ball/Duplicate Daffy
Friday, April 1 - 11:15 A.M. (EST) - 123 - Key-Tastrophe/Hole Gag: Hammer the Rabbit Hole/A Devil of a Drink
Friday, April 1 - 7 P.M. (EST) - 210 - Mt. Neverest/Telephone Pole Gag: Zip Line/Fast & Steady
Friday, April 1 - 7:15 P.M. (EST) - 125 - Bounty Bunny/Hole Gag: Underwear/Vender Bender
Sunday, April 3 - 5:30 P.M. (EST) - 124 - Weaselin' In/Time Out!
Sunday, April 3 - 5:45 P.M. (EST) - 126 - Mallard Practice/Beaky Buzzard: Mouse/Born to Be Wile E.
Movies/Specials
Friday, April 1 - 5 P.M. (EST) - Shrek Forever After
Sunday, April 3 - 6 P.M. (EST) - Napoleon Dynamite
Sunday, April 10 - 6 P.M. (EST) - Harry Potter 20th Anniversary: Return to Hogwarts
Saturday, April 30 - 7 P.M. (EST) - See Us Coming Together: A Sesame Street Special
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