Amphibious. Cthulhu can breathe in air and water.

Cantrips (At-Will): Eldrich Blast, Shape Water, Thaumaturgy

1st Level Spells (4 Slots): Detect Magic, Magic Missile, Shield , Arms of Hadar 

2nd Level Spells (1 Slot): Hold Person, Mind Spike

Familiar. The Baby Chtuluhu can serve another creature as a familiar, forming a magic, telepathic bond with that willing companion. While the two are bonded, the companion can sense what the Baby Chtuluhu senses as long as they are within 1 mile of each other. While the Baby Chtuluhu is within 10 feet of its companion, the companion shares the Baby Chtuluhu Amphibious trait. At any time and for any reason, the Baby Chtuluhu can end its service as a familiar, ending the telepathic bond.

Multiattack. The baby can make two attacks: one with its tentacle and one with its beak.

Tentacle. Melee Weapon Attack: +2 to hit, reach 10 ft., one target. Hit: 2 (1d2 + 2) Bludgeoning damage.

Beak.  Melee Weapon Attack:  +4 to hit, reach 5 ft., one target. Hit:4(2d4+2) Piercing damage

Cantrips (At-Will): Eldrich Blast, Shape Water, Thaumaturgy

1st Level Spells (2 Slots): Detect Magic, Magic Missile, Shield, Arms of Hadar

2nd Level Spells (1 Slot): Hold Person, Mind Spike