Sentence 1 : Being a mum is hard enough without adding more stress.

Sentence 2: Without adding more stress being a mum is hard enough.

The two sentences convey the same basic meaning, but there is a slight difference in emphasis due to the word order.

Sentence 1: "Being a mum is hard enough without adding more stress."

This sentence places the main focus on the difficulty of being a mum, and then adds the additional information that adding more stress would make it even harder.

Sentence 2: "Without adding more stress being a mum is hard enough."

This sentence starts with the condition "without adding more stress," which slightly emphasizes the idea that the stress is an external factor that could make the already difficult job of being a mum even harder. However, the overall meaning is still the same as Sentence 1.

In summary, while the two sentences are very similar in meaning, the word order creates a slight difference in emphasis.