It’s a sad day for us Antilop-lovers… there’s been a recall.
Information and link below, seemingly the belt is coming open on some of them (which is why you need to check the product number) and small children are escaping their bounds. To which I say oh dear that is a shame BUT let’s face it, guys, the belt has always been pretty rubbish. 
Sure enough, mine always held fast but given that it didn’t go over the shoulders of my Houdini-esque children it was never enough to hold them if they wanted to mount a serious break-out. Which I liked, rather controversially, as I always figured if they were keen to get out of their seats, let ’em out, they were probably done with eating. Very BLW, har har.
Everything depends on circumstance, of course, and had it not been for the fact that they only used the highchair for eating so I was watching them anyway, I might have been less relaxed about it. Or indeed had my children been less greedy.
Anyway, chisel the Weetabix off the bottom of your highchairs, look for the product number and call Ikea if you’re in the relevant group, but the message is… don’t get too complacent even if you aren’t. If your child is inclined to lurch suddenly in a bid for freedom and your reflexes aren’t up to it, consider getting some kiddie reins like these Clippasafe ones and threading them through the chair. Don’t fret, they’re washable…
“IKEA recalls ANTILOP children’s high chair belt
2012-01-05
IKEA kindly asks customers who have an ANTILOP high chair from supplier #17389 and production date 0607-0911 (YYMM) to immediately contact Customer Services.
The high chair belt can open unexpectedly in use, creating a fall hazard. IKEA has received eight reports of belt opening, including three resulting in minor injury when a child fell from the high chair.
Only ANTILOP high chairs from supplier #17389 with production dates 0607-0911 (YYMM) are affected. The supplier number and production date are moulded into the underside of the seat:
Customers with an ANTILOP high chair are asked to check the supplier number and production date. If the supplier number is #17389 and the production date is 0607-0911 (YYMM) customers are asked to visit IKEA or contact IKEA Customer Service on 0845 358 3364 to receive a replacement belt, free of charge.
No other high chairs are affected. IKEA apologises for any inconvenience this may cause.”