Around 20 weeks, movements usually become easier to recognise, and they keep building from here. By 24 weeks, you should have felt your baby move: if you haven't, that's a reason to call.
What you may feel
The NHS week-by-week guide describes 20 weeks as a time when you may feel a bubbling or fluttering in your belly, which could be your baby moving around, and when your baby is getting more active, kicking, punching and turning.
Movements can feel like a kick, flutter, swish or roll (NHS, RCOG). If this is your first baby, this is often when the first ones arrive: the NHS says you might not feel movements until after 20 weeks.
Movements build from here
Movements tend to increase and get stronger until about 32 weeks, and then stay about the same until you give birth (RCOG, Tommy's). There's no set number you should feel. Every baby is different (NHS).
You may notice them more when you're sitting or lying still, and less on busy days (RCOG). What counts as a kick covers rolls, swishes and hiccups.
If you haven't felt your baby move by 24 weeks
RCOG advises that if by 24 weeks you have never felt your baby move, you should contact your midwife or maternity unit. They will check your baby's heartbeat, and an ultrasound scan may be arranged.
If movements change
Once you've been feeling your baby move, a change matters more than any number. If movements slow down, stop or feel different, contact your midwife, doctor or maternity unit straight away. Do not wait until tomorrow (NHS). What to do.