I found this on WalfordWeb
"EASTENDERS Little Mo Slater will accidentally smother baby Freddie to death after motherhood becomes too much.
Viewers will be left stunned when Little Mo (played by Kacey Ainsworth) holds a pillow over her son's face when she's left to mind him alone and he refuses to stop screaming. As the tot falls silent the horror hits Mo that she's suffocated her own son. She dashes to the doctor's surgery with the baby in her arms but is too late.
Square residents are left shell shocked and offer their support and sympathy but it soon becomes apparent that Little Mo is to blame and she is almost driven out of town before being carted away from Walford by police. Even new love interest Dr. Oliver (played by Tom Ellis) sends her packing when Mo tries to explain it was a moment of madness.
The storyline unfolds at the end of May."