Cocoro
Japanese in London — 4.3★ (1,069 Google reviews).
Steakhouse · Soho
Reform Social & Grill is a relaxed Marylebone spot where the food takes centre stage — think generous lamb shank with rich jus, or a proper afternoon tea that the whole family can book ahead and enjoy at a leisurely pace. The staff are genuinely attentive and good-humoured, and if you have vegan or vegetarian members in your group they'll happily talk you through a solid range of alternatives. It's buggy-accessible and has a kids' menu, with highchairs likely available if you ask when booking — no outdoor space, but the welcoming atmosphere inside more than makes up for it.

The secret to a calmer meal out? Something to do that isn't a phone. Each pack is full of screen-free bits and bobs to keep little hands busy at the table and buy you a proper sit-down. Three printable packs, one for each age (toddler, preschool, primary) — free, straight to your inbox.
Japanese in London — 4.3★ (1,069 Google reviews).
Charming old-school Marylebone deli-café; buggy-friendly and full of character.
Sri lankan in London with highchairs and outdoor seating — 4.6★ (4,608 Google reviews).