Yes, by rules, MH gold let you bring one guest, child over age 2 consider as one guest.

However, sometimes the contracted lounge might unsure if MH gold/OW sapphire/OW emerald lounge access rule. So, you can prepare a screenshot of Enrich gold on lounge access to show to them. This happens to me when I was in Manchester Escape Plus Lounge. However, the staff was very kind enough to make a call to confirm my sapphire status allow me to bring a guest in.