Smaller Slimes have the same amount of health as larger Slimes
When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
Update by [~576874]
As of 1.0.0.0 (beta build 3)
Tiny slimes have 0.5 health points - tested by punching the slime with a empty hand (+0.5 attack damage)., one hit kill
Small slimes have 4 health points - tested with a wood sword (+4 attack damage), one hit kill
Big slimes have 14 health points, when they should have 16 health points - tested with 2 diamond sword strikes (14 attack points). This method kills the big slime.
Created Issue:
Smaller Slimes have the same amount of health as larger Slimes
When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
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When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
Update by [~576874]
As of 1.0.0.0 (beta build 3)
Tiny slimes have 0.5 health points - tested by punching the slime with a empty hand, one hit kill
Small slimes have 4 health points - tested with a wood sword (+4 attack damage), one hit kill
Big slimes have 14 health points, when they should have 16 health points - tested with 2 diamond sword strikes (14 attack points). This method kills the big slime.
When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
Update by [~576874]
As of 1.0.0.0 (beta build 3)
Tiny slimes have 0.5 health points - tested by punching the slime with a empty hand (+0.5 attack damage)., one hit kill
Small slimes have 4 health points - tested with a wood sword (+4 attack damage), one hit kill
Big slimes have 14 health points, when they should have 16 health points - tested with 2 diamond sword strikes (14 attack points). This method kills the big slime.
When you attack a Slime, either spawned naturally or through spawn eggs, The size of the Slime doesn't affect the health of the Slime. All Slimes I encountered take three hits with an unenchanted diamond sword to kill, or two hits if one of those is a critical hit. The sword itself hasn't had it's damage changed (tested by attacking Zombies and Skeletons)
Calculating the damage from 3 diamond sword hits (21 damage) or one regular hit and a critical hit (17,5 damage), this means all Slimes have between 7 and 10.5 hearts of health, regardless of size.
Update by [~576874]
As of 1.0.0.0 (beta build 3)
Tiny slimes have 0.5 health points - tested by punching the slime with a empty hand (+0.5 attack damage)., one hit kill
Small slimes have 4 health points - tested with a wood sword (+4 attack damage), one hit kill
Big slimes have 14 health points, when they should have 16 health points - tested with 2 diamond sword strikes (14 attack points). This method kills the big slime.
clones
duplicates
clones
Duplicate of MCPE-17593.
Thanks for the report but sadly it has been reported before as MCPE-17593 . If you did not this time, please search for your issue before reporting it to see if it has already been reported by someone else.
Re-resolving as a duplicate in favor of the more-descriptive MCPE-17593, which was fixed.

This bug is also in the Android version. Lenovo A10 device.
the same goes for magma cubes
also none of the TPs work on magma cubes or slimes
I can confirm the same issue. It affects slimes spawned on their own, as well as slimes that "split" from larger ones. Affects both magma cubes and slimes.
I can confirm this for magma cubes on windows 10.
Does not affect 0.17.0.2. It was probably fixed.
Seems to be fixed in 1.0.0.